clark county standard details manual

clark county standard details manual

These standards are intended to preserve the community’s quality of life and to minimize total costs over the life of the transportation facility. Private bridges are addressed in Section 40.350.040. Particular attention has been paid to Chapter 5, Transportation Element. The Arterial Atlas identifies all arterials and collectors and specifies the design of these facilities in general terms. This section requires the inclusion of pedestrian and bikeway facilities in frontage improvements based on the functional classification adopted in the Arterial Atlas. The purpose of a functional classification system for county roads is to define varying levels and types of transportation facilities that provide for the safe and efficient movement of people and goods, while preserving residential areas and maintaining the economic vitality of commercial and industrial areas. The system classifies transportation facilities as either urban or rural roads. Both urban and rural roads are further divided into arterials, collectors, and access roads.The county’s functional classification system for arterials is intended to be in compliance with the federal classification system. Urban roads are classified as outlined below: The purpose of this county road is to carry high volumes of traffic through the urban area and between major regional activity centers. This class of roadway is of primary importance in the regional transportation system as it carries a high proportion of the total urban-area travel. Access is normally limited to intersections with other arterials. Direct land access is prohibited. All other functional classifications supplement the principal arterial network. It carries large volumes of traffic over long distances. Access is generally limited to intersections with other arterials and collectors. Signalized intersection spacing is regulated. Direct land access is minimal and managed, but is less restrictive than access from parkway arterials.http://customoid.co.uk/userfiles/bob-stroller-strides-exercise-manual.xml

• clark county standard details manual, clark county standard details manual, clark county standard details manual pdf, clark county standard details manual download, clark county standard details manual online, clark county standard details manual 2017, clark county standard details manual.

Spacing is typically two (2) to five (5) miles. Minor arterials provide for movement within subareas of the county, whose boundaries are largely defined by principal arterial roadways. They serve through traffic and provide direct access to large commercial, industrial, office and multifamily development but, generally, not to single-family residential properties. Spacing is typically less than two (2) miles. The collector street also collects traffic from local streets and channels it into the arterial system. Direct access to adjacent land uses, however, is still subordinate to traffic movement. Access to abutting properties is controlled through driveway spacing and pavement markings. Typically, collectors are not continuous for any great length, nor do they form a connected network by themselves. Spacing is typically less than two (2) miles. Through trips are discouraged and parking is allowed. In general, these streets connect local access streets to collectors. Through trips are discouraged and parking is usually allowed. In general, these streets do not directly connect to arterials or collectors. Parking is allowed. The use of shared driveways off of short cul-de-sacs requires Fire Marshal approval. This allows streets at the front of properties not to be encumbered with driveways. Alleys are an alternative to frontage access. Parking is not allowed. Through trips are discouraged and parking is optional. Bike lanes may be required when the projected average daily trips exceed three thousand (3,000). Driveway access is not permitted; wide sidewalks, curb bulb-outs and parking are required. Rural roads are classified as follows: They provide adequate right-of-way for future urban arterial routes. The provision of land access remains subordinate to providing for traffic movement. Parking is not allowed. Their primary purpose is to link rural centers with nearby towns and cities and with state arterial routes. Parking is not allowed.http://cornwallstaffagency.com/userfiles/bobbi-brown-makeup-manual-book.xml

They are spaced so as to be accessible to all developed areas within the county. The provision of land access is given the same priority as the provision of traffic movement. Parking is not allowed. Parking is not allowed. Scenic routes seek to enhance, preserve and facilitate the enjoyment of those scenic or historical features unique to each route. When possible, existing alignment and roadway sections shall be used. Urban or rural collector standards shall be used for right-of-way and roadway sections. The Public Works Director may modify the standards to accommodate unique scenic or historic design considerations. The following are special applications of the functional classifications. Chapter 5 of the comprehensive plan lists additional transportation improvements required in specific geographic areas. All public and private roads shall be paved and constructed with sidewalks. The requirements for a transportation impact study are stated in Section 40.350.020 (D). The purpose of this section is to ensure adequate cross-circulation in a manner which allows subsequent developments to meet these standards, and to provide a mechanism for integrating various streets into an efficient and safe transportation network. Applicants shall submit a circulation plan which includes the subject site and all adjacent parcels. Proposed streets must be shown to the point of connection with the existing street system within six hundred (600) feet. The circulation plan shall demonstrate feasibility with development of adjacent properties, or may revise the off-site portion of prior approved plans. Circulation plans shall also be consistent with the Arterial Atlas, as amended. A circulation plan shall be submitted at application. Draft circulation plans may be submitted at preapplication. The plan should include sufficient off-site and on-site conditions to evaluate it against the review criteria.

It shall include: Additional explanation or an additional legend may be required to adequately show proposed on-site facilities. Rural circulation plans shall be schematic in nature and based on the appropriate quarter-section map. The plan should include sufficient on-site and off-site conditions to evaluate it against the review criteria. Rural circulation plans shall include: Cross-circulation shall be provided in a manner that meets these standards and, where possible, that will allow subsequent developments to meet these standards: The block perimeter shall not exceed three thousand two hundred (3,200) feet unless accessway(s) for pedestrian or bicycle circulation are provided or where topographic or other physical constraints preclude achieving this standard. The access street system shall: The design criteria set out in Tables 40.350.030-2 and 40.350.030-3 are adopted as a portion of the Clark County standard specifications. Such criteria are applicable to roads located within and adjacent to a development. These criteria are intended for normal conditions. The responsible official may require higher standards for unusual site conditions. Core road features as shown on the Standard Details Manual drawings allow little, if any, variation unless a road modification request is approved. Such features shall be subject to approval by the Public Works Director and shall be designed to ensure adequate public safety. Flex zone features can include stormwater best management practice features, parking and bike lanes, sidewalks, and planter and utility strips, depending on the road classification. These features may be designed with considerable flexibility subject to engineering approval by the county; however, all features applicable to the road classification shall be provided. Some flex zone features may require more right-of-way than is noted in Table 40.350.030-2.

Stormwater low impact development features as found in the Clark County Stormwater Manual are allowed with approval from the Public Works Director. Stormwater features shall be designed and constructed to ensure adequate public safety. Right-of-way in excess of that required in Table 40.350.030-2 may be needed to accommodate stormwater features. Permeable pavement may be used for the following: The Public Works Director shall require that infiltration features located in close proximity to utilities be designed to accommodate the utilities; Where required, on-street parking shall be subject to the following: Acceptable methods include the use of abutting driveways, twenty (20) foot wide travel-way clear zones, or other methods as may be approved by the Public Works Director; or. Single on-street parallel parking spaces between driveways shall be at least seventeen (17) feet in length, measured from five (5) feet from the top of the slope of the driveway wing or end of the curb radius. Two (2) or more consecutive on-street parallel parking spaces shall require two (2) additional feet between each space. Curb extensions at intersections may be required for storefront streets, subject to Section 9.1.2 of the Highway 99 Overlay District Standards in Appendix F to Title 40, or for mixed-use developments. Such extensions shall not count toward the mid-block percentage requirements in this subsection. Approval of such curb extensions shall require demonstration of adequate vehicular turning movement capability. The length of curb extensions at intersections shall be measured between the tangent of the standard curb and the face of the curb of the intersecting street. “Block length” is the distance between road intersections as measured along the nearside right-of-way or easement line. When curbs are required, vertical curb is required for all roads except for cul-de-sac bulbs. See Section 40.350.

030 (B)(3)(b)(1)(a) for additional details regarding bike and parking lane surfacing requirements. Turn lanes shall be impervious pavement. Parking limited to urban collectors (two (2) lanes). Detached sidewalks shall be at least five (5) feet wide; attached sidewalks shall be at least eight (8) feet wide. Public streets shall require walkways on both sides of the street. Private streets shall require walkways on at least one (1) side. Where two (2) driveways are permitted, a minimum separation of fifty (50) feet shall be required between the driveways, measured from near edge to near edge. The County Engineer, in reliance upon the determination of the applicant’s professional engineer that the proposal for a stop sign meets the criteria above, may authorize the installation of a stop sign(s). Where a residential corner lot is located at the intersection of a nonarterial or noncollector street with an arterial street, the corner clearance requirements of Section 40.350.030 (B)(4)(c)(2)(f) shall apply to the nonarterial or noncollector street. A maximum of two (2) driveways may be permitted to a residential lot or individual duplex unit meeting the spacing requirements of Section 40.350.030 (B)(4)(b). Joint-use driveways may be allowed and will count as a driveway for each residential lot or duplex unit. For a joint-use driveway, a minimum of a twenty (20) foot wide easement is required. Driveways shall have a minimum width of twelve (12) feet of clear, unobstructed all-weather driving surface and an overhead clearance of thirteen (13) feet, six (6) inches. The first, or only, driveway shall be twelve (12) feet to thirty-five (35) feet in width. If a second driveway is allowed, the maximum width of the second driveway will be fifteen (15) feet. There shall also be approved turnouts constructed such that the maximum distance from turnout to turnout, or from turnout to turnarounds, does not exceed five hundred (500) feet.

Turnouts shall comply with the Standard Details Manual.The second vehicle access road may be a county emergency-only access road, if it serves less than two hundred (200) lots or dwelling units. However, the review authority may require a traffic circulation study showing a balanced traffic flow of less than two thousand (2,000) vehicles per day past any dwelling unit accessing on a neighborhood circulator road or lesser classification upon full buildout. Street stubs built to the property line of property not under the developer’s control do not qualify for such an exception. Road approach permits not associated with development shall be reviewed using a Type I process. No residential driveways in the urban area will be permitted to access collectors unless no other access to the site exists or can be made available. Residential driveways in the rural area will not be permitted to access collectors if direct lot access is available to an existing rural access road as defined in Tables 40.350.030-2 and 40.350.030-3. Where raised channelization exists, only those driveways on the development side of the road will be considered for minimum separation requirements. The number of driveways and driveway lanes shall be based upon an estimate of site traffic generation in accordance with Table 40.350.030-5. Multiple driveways are not permitted until the estimated ADT exceeds the number shown in the second column for the different types of land use. Then, an additional driveway is allowed each time the estimated ADT increases above the previous maximum ADT for each driveway as shown in the third column; provided, that the additional driveways meet the spacing requirements specified in Table 40.350.030-4. Two (2) driveway exit lanes are allowed when the ADT exceeds seven hundred (700). A nonresidential two (2) way driveway onto a collector shall be twenty-four (24) to forty (40) feet in width.

To provide adequate corner clearance, the tangent curb length between the nearest edge of a driveway on an intersecting side street and a collector roadway, or a driveway on a collector roadway and an intersection with a cross street, shall be fifty (50) feet. Where the intersection is signalized or is planned for signalization, driveways shall be limited to right-turn movements if located within one hundred twenty-five (125) feet of a collector or as provided for in Section 40.350.030 (B)(4)(d)(2). A temporary driveway may be allowed when, due to conditions beyond the control of the applicant, minimum driveway separation cannot be achieved at the time of application. The review authority may approve a temporary driveway when an access plan shows future removal of the temporary driveway and a new driveway which meets the spacing standards shown above. The installation of other improvements such as left-turn lanes, right-turn lanes and traffic signals may be required by the County Engineer where found necessary on the basis of a traffic engineering study. The study shall address operations of the driveway or intersection, including the adequacy of vehicular turning movements. In order to limit the number of residential roads intersecting with arterials while providing adequate neighborhood circulation, residential roads intersecting with urban arterials shall be classified and constructed to standards applicable to local residential access or collector roads unless the review authority finds that a lesser classification adequately provides for the circulation needs of the surrounding area. In those cases in which an urban access street is less than thirty-six (36) feet wide, such street shall have a minimum width of thirty-six (36) feet at the intersection with the arterial and shall be tapered according to accepted engineering practices and supplemental standards in Section 40.350.030 (C)(1)(b) as determined by the Public Works Director.

Road approach permits not associated with development shall be reviewed using a Type I process. Where permitted, the number of driveways and driveway lanes on arterials shall be based upon an estimate of site traffic generation in accordance with Table 40.350.030-6. A commercial and multifamily two (2) way driveway onto an arterial shall be twenty-four (24) to forty (40) feet in width. To provide adequate corner clearance, the tangent curb length between the nearest edge of a driveway on an intersecting side street and an arterial roadway, or a driveway on an arterial roadway and an intersection with a cross street, shall be fifty (50) feet. Where the intersection is signalized or is planned for signalization, driveways shall be limited to right-turn movements if located within two hundred fifty (250) feet on minor and principal arterials or as provided for in Section 40.350.030 (B)(4)(d)(2). A temporary driveway may be allowed when, due to temporary conditions beyond the control of the applicant, minimum driveway separation cannot be achieved at the time of application. The review authority may approve a temporary driveway when an access plan shows future removal of the temporary driveway and a new driveway which meets the spacing standards shown above is assured to be constructed. The installation of other improvements such as left-turn lanes, right-turn lanes and traffic signals may be required by the County Engineer where found necessary on the basis of a traffic engineering study. The study shall address operations of the driveway or intersection, including the adequacy of vehicular turning movements. In order to preserve capacity and promote safety, urban arterials shall generally include raised medians to restrict cross traffic movements. In general, full-access intersections, signalized and nonsignalized, on arterials will be permitted only with other county, state and city roads as are designated on the Arterial Atlas, as amended.

Circulation from such intersections in most cases will satisfy the access needs of adjacent land. Any decision by the county that a raised median will not be installed on an arterial will require a specific determination by the County Engineer that (a) the roadway will operate safely without a raised median and (b) that the roadway will operate at the required capacity without a raised median. Other factors to be considered by the County Engineer include, but are not limited to, the traffic volumes and speeds on the roadway, the crash history on the roadway, roadway geometric factors and other characteristics, and the adequacy of sight lines and distances. Additionally, the number of fronting driveways, the traffic volumes on those driveways, the likely adverse impacts on fronting and other properties, the extent of access control along the arterial, and the number and location of other accesses available to those properties will be considered. Unless already fully developed to the transportation standards and subject to the limitations set forth in this section and in Sections 40.350.030 (B)(15) and 40.550.010, a partial-width road shall be established and constructed to the applicable right-of-way or easement and improvement standards set out in Section 40.350.030 to that portion of a frontage public or private road which abuts a parcel being developed as a condition of development approval. If sufficient right-of-way is not available, slope easements from neighboring properties are an acceptable alternative. Such easements shall be recorded with the final plat. The county may require the proposed road cross-sections showing neighboring topography be submitted in order to determine if the partial-width road can be constructed as required. Where remaining life of the pavement is less than five (5) years, the developer shall construct the roadway to current standards to the centerline or twenty-two (22) feet, whichever is less.

If remaining life is greater than five (5) years, the road shall be cut back to a location where the structure is sound and the widening constructed. However, in no case shall the reconstruction be less than four (4) feet in width from the existing edge of pavement to the new edge of pavement or face of curb. The county may require reconstruction to the centerline or twenty-two (22) feet, whichever is less, if the review authority determines the geometrics or other existing features are inadequate. For the purposes of this subsection, “share” of the cost of deferred frontage improvements includes the then-current cost of engineering and frontage improvements required at preliminary development approval divided by the number of lots. Deferrals of improvements under this subsection may be denied when: All roads providing access to parcels being developed, whether such roads are to be public or private, shall at a minimum: Any preexisting roadway narrower than eighteen (18) feet with one (1) foot shoulders shall be widened to the full twenty (20) foot standard. Those portions of a roadway reduced in width due to curb extensions allowed under Section 40.350.030 (B)(5)(a)(2) are not required to meet the above requirement, provided a minimum of sixteen (16) feet of pavement is provided. Any preexisting roadway narrower than eighteen (18) feet shall be widened to the full twenty (20) foot standard. The owners of a parcel being developed shall enter into a signal participation agreement to contribute a proportionate share towards the cost of a traffic signal when: Private and public roads shall be laid out so as to intersect at an angle as near to a right angle as practicable, but in no case less than seventy-five (75) degrees for roads intersecting collectors and arterials and no less than sixty (60) degrees for access roads, unless modified pursuant to Section 40.550.010.

Opposing roads accessing an intersection shall either be aligned or will be separated by a minimum intersection spacing, as specified in Table 40.350.030-3. Depending on the width of the intersection opening, an offset greater than ten (10) feet for access roads or five (5) feet for collectors and arterials is not allowed. Intersections shall have a minimum corner radius of ten (10) feet along the right-of-way lines for access roads and a minimum corner radius of twenty-five (25) feet along the right-of-way lines for collectors and arterials, unless road improvements require a greater radius. The county will accept an easement for this chord instead of dedication of right-of-way. For arterials intersecting with other arterials, an additional six (6) feet of right-of-way may be required on both sides of the roadway if a future turning lane is required, based on transportation impact study, within twenty (20) years from the time an application is submitted. The length of the additional right-of-way shall be determined based on the transportation impact study. Where connecting to a paved street, whether public or private, the connecting road or driveway (excluding driveways in rural area) shall be paved twenty-five (25) feet back from the nearest edge of the traveled lane, or shall be equal to the minimum intersection radii as specified in Table 40.350.030-3, whichever is greater. Unless modified pursuant to Section 40.550.010, public and private roads shall comply with the following sight distance requirements: Intersection sight distance and stopping sight distance values are based on the default assumption of level grades, normally intersecting roadways, and with passenger cars as the design vehicle.For multilane highways, the object on the uncontrolled roadway shall be located on the approach lane closest to the controlled side street.

For roads with a posted speed of twenty-five (25) mph or less, traffic entering an uncontrolled public road from a yield-controlled public road shall have minimum intersection sight distance of two hundred fifty (250) feet. The intersection sight distance shall be measured at one hundred thirty (130) feet back on the yield-controlled approach from the line that is four (4) feet from the uncontrolled roadway center, in drivers’ direction, for both approaches. Uncontrolled intersections for access roads in urban and rural areas with a posted speed limit of twenty-five (25) mph or less shall have an unobstructed intersection sight distance triangle per Section 40.350.030 (B)(8)(b) of one hundred (100) feet on both approaches. This requirement may be reduced to eighty (80) feet for intersections abutting corner lots in an urban residential subdivision. The intersection sight distance shall be measured along the lines four (4) feet from the roadway center, in drivers’ direction, for both approaches. New urban and rural residential driveways accessing roads with a speed limit of over twenty-five (25) mph are subject to Table 40.350.030-8. Where a public or private road has been constructed, created or stubbed in such a manner as to be able to be extended or widened in accordance with the Clark County Arterial Atlas, other requirements of this section, or prior approved development, the following shall apply: All residences, buildings or structures shall be constructed in such a position on the property that they will not interfere with the extension or widening of the roadway to adjacent areas and shall be so situated that such extension will make orderly and planned development for additional road installations to meet the reasonable minimum requirements of good and safe traffic circulation, consistent with applicable zoning setbacks.

Right-of-way or private easements necessary to such extension or widening and falling within parcels being developed shall be granted or created as a condition of development approval. Any street within the urban area for which an extension in the future is planned shall be extended to the edge of the property being developed through the plat, short plat or site plan approval process, unless otherwise approved by the review authority. The street stub shall be a full street section, including sidewalks. If a road serving more than eighteen (18) dwelling units or more than one hundred fifty (150) feet in length temporarily terminates at a property boundary, a temporary turnaround cul-de-sac bulb consistent with this standard shall be constructed near the plat boundary. The bulb shall be paved and shall be eighty (80) feet in diameter, which may include the width of the roadway with sidewalks, where required, terminating at the point where the bulb radius begins. Removal of the temporary turnaround and extension of the sidewalk shall be the responsibility of the developer who extends the road (see the Standard Details Manual). The easement for a temporary turnaround may be extinguished without county approval after the temporary turnaround is determined to be no longer necessary by the county. Private roads are not allowed in either the urban or rural area: Private roads within developments may be allowed, provided they meet the following additional criteria: Any private access street shall remain a private street unless it is upgraded to public street standards at the expense of the developer or abutting lot owners to include hard surface paving and is accepted by the county for public ownership and maintenance. The minimum right-of-way diameter across the bulb section is seventy (70) feet, with a minimum pavement diameter across the bulb section of sixty (60) feet.

Rolled curb and gutter and thickened sidewalk shall be constructed in accordance with the Standard Details Manual. The minimum right-of-way diameter across the bulb section is one hundred (100) feet, with a minimum pavement diameter across the bulb of ninety (90) feet. Alternatively, right-of-way may be reduced to eighty (80) feet, with a paved diameter across the bulb of seventy (70) feet, provided rolled curb and gutter with thickened sidewalk is constructed in accordance with the Standard Details Manual. Temporary cul-de-sacs shall provide at minimum paved diameter of eighty (80) feet for the bulb. Those portions of the bulb area lying outside the straight-street right-of-way shall be provided as a temporary easement pending extension of the street. Optional feature for any cul-de-sac when the bulb’s paved diameter is ninety (90) feet or less; mandatory when the bulb’s paved diameter exceeds ninety (90) feet. If provided, islands shall have full-depth vertical curbs. Minimum island diameter shall be twenty (20) feet and there shall be at least twenty-two (22) feet of paved traveled way in a shoulder type section; thirty (30) feet of paved traveled way in a curb type section around the circumference. Islands shall be grassed or landscaped. Islands shall be maintained by the adjoining lot owners. Islands are required on eyebrows with a radius greater than thirty (30) feet. The minimum island diameter shall be ten (10) feet. Proposed modifications to this rule will be considered by the review authority, based on pertinent traffic planning factors such as topography, sensitive areas and existing development. Approved turnarounds may include cul-de-sacs, which may include the width of the roadway, intersecting public or private roads, hammerheads, or driveways meeting the dimensional requirements of a hammerhead. Dimensional requirements for all transportation-related features in this subsection are as drawn in the Standard Details Manual.