Differences

This shows you the differences between two versions of the page.

--- street-lane-widths [2024/03/01 17:10] – created 67.163.111.76
+++ street-lane-widths [2024/03/01 18:23] (current) – 67.163.111.76
@@ Line 1: / Line 1: @@
 ======Street Lane Widths=====
-This page attempts to lay out the various layers of standards, requirements, ordinances, etc. that lead street and road designs in [[city-of-lynchburg|Lynchburg, Virginia]] to use the lane widths that they do.
+This page attempts to lay out the various layers of standards, requirements, ordinances, etc. that lead street and road designs in [[city-of-lynchburg|Lynchburg, Virginia]] to use the lane widths that they do, as well as some alternative standards that exist.
 =====AASHTO=====
-====A Policy on Geometric Design of Highways and Streets====
+====A Policy on Geometric Design of Highways and Streets, 7th Edition (used by Lynchburg)====
     * 5.3 Local Streets in Urban Areas
@@ Line 22: / Line 22: @@
         * 7.3.3.4 Number of Lanes
             * "The number of lanes varies, depending on traffic demand, presence and needs of other users, and availability of the right-of-way, bu the typical range for arterials in urban areas is **four to eight** through lanes in both directions of travel combined. Many minor arterials may have **two** through-travel lanes, **one** in each direction. A capacity analysis for all users should be performed to determine the proper number of lanes in consideration of the space needed to accommodate all users of the right-of-way. In addition, roadways are sometimes widened through intersections by the addition of **one or two** auxiliary lanes to accommodate turning vehicles. Section 2.4 presents additional information on capacity analysis."
+====Guide for the Development of Bicycle Facilities, 4th Edition (probably used by Lynchburg)====
+    * 4.6.4 Bicycle Lane Widths
+        * "Bicycle lane widths should be determined by context and anticipated use. The speed, volume, and type of vehicles in adjacent lanes significantly affects bicyclists' comfort and desire for lateral separation from other vehicles. Bike lane widths should be measured from the center of the bike lane line. The appropriate width should take into account design features at the right edge of the bicycle lane, such as the curb, gutter, on-street parking lane, or guardrail. Figure 4-13 shows two typical locations for bicycle lanes in relation to the rest of the roadway, and the widths associated with these facilities."
+        * "As discussed in the previous chapter, a bicyclist's preferred operating width is **5 ft (1.5 m)**. Therefore, under most circumstances the recommended width for bike lanes is **5 ft (1.5 m)**. Wider bicycle lanes may be desirable under the following conditions"
+        * "Adjacent to a narrow parking lane (7 ft [2.1 m]) with high turnover (such as those servicing restaurants, shops, or entertainment venues), a wider bicycle lane (**6-7 ft or 1.8-2.1 m**) provides more operating space for bicyclists to ride out of the area of opening vehicle doors."
+        * "In areas with high bicycle use and without on-street parking, a bicycle lane width of **6 to 8 ft (1.8-2.4 m)** makes it possible for bicyclists to ride side-by-side or pass each other without leaving the lane."
+        * "On high-speed (greater than 45 mph [70 km/h] and high-volume roadways, or where there is a substantial volume of heavy vehicles, a **wide** bicycle lane provides additional lateral separation between motor vehicles and bicycles to minimize wind blast and other effects."
 =====NACTO=====
-====Urban Street Design Guide====
+====Urban Street Design Guide (not used by Lynchburg)====
-    * Lane Width
+    * Lane Width **[[https://nacto.org/publication/urban-street-design-guide/street-design-elements/lane-width|Summary]]**
         * " Lane widths of **10 feet** are appropriate in urban areas and have a positive impact on a street's safety without impacting traffic operations. For designated truck or transit routes, one travel lane of **11 feet** may be used in each direction. In select cases, narrower travel lanes (9–9.5 feet) can be effective as through lanes in conjunction with a turn lane."
+=====Virginia DHCD=====
+====Virginia Statewide Fire Prevention Code 2015 (adopted by Lynchburg ordinance)====
+    * 503.2.1 Dimensions
+        * "Fire apparatus access roads shall have an unobstructed width of not less than 20 feet (6096 mm), exclusive of shoulders, except for approved security gates in accordance with Section 503.6, and an unobstructed vertical clearance of not less than 13 feet 6 inches (4115 mm). Exception: Fire apparatus access roads exclusively serving single family dwelling or townhouse developments that are fully sprinklered, as provided for in Sections R313.1 or R313.2 of the International Residential Code, shall have an unobstructed width of not less than 18 feet (5486 mm), exclusive of shoulders."
 **Assume that any quotations on this page are under copyright of the original author. They are copied here for the purpose of study and criticism, which constitutes fair use.**
+=====Lynchburg, Virginia=====
+====Code of Ordinances====
+    * [[https://library.municode.com/va/lynchburg/codes/code_of_ordinances?nodeId=CH24.1SUOR_ARTVIGERE_S24.1-30ST|Section 24.1-30]](g) Minimum widths
+        * "The minimum width of proposed streets, measured from lot line to lot line, shall be in accordance with regulations established by the City of Lynchburg, Manual of Specifications and Standard Details. Street widths are typically but not always **50 feet** in width. The street width shall be based on the post development average daily traffic and shall be of sufficient width to accommodate the typical street cross section designated therein. If an existing street is to be utilized for access and such street is not of sufficient width per the criteria of the City of Lynchburg Manual of Specifications and Standard Details and the subdivider owns property on both sides of the street, then provisions shall be made on the plat to widen the street to accommodate the standard street width. Should the subdivider abut on only one side of an existing street, then provisions shall be made on the plat to widen one-half of the street to accommodate the standard street width as measured from the centerline of the existing street."
+    * [[https://www.lynchburgva.gov/452/Manual-of-Specifications|Manual of Specifications and Standard Details]]
+        * 25.01 TYPICAL CURB and GUTTER STREET SECTION
+            * {{ :25-01-1.pdf |25.01 (page 1)}}
+            * {{ :25-01-2.pdf |25.01 (page 2)}}