BICYCLE FACILITY DESIGN REVIEW/GENERAL ROADWAY ISSUES
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All roadways should be designed with the assumption that they will be used by bicyclists, unless bicycling is specifically prohibited on a road by the Virginia Commonwealth Transportation Board (CTB). Safe, convenient and well-designed roadways benefit road users and can encourage bicycle use and transit connections. Any new facilities may be in service for decades, so the design is critical for users. Once construction is completed, changes are not easy to make. Many small design details affect safety and connectivity for bicycling.
Design Standards & Guidelines::
Numerous standards, guidelines and policies are followed in roadway
- AASHTO, A Policy on Geometric Design of Highways and Streets
(the Green Book): road design guidelines
- FHWA, Manual on Uniform Traffic Control Devices (MUTCD):
standards for all signs, signals and markings
- AASHTO, Guide for the Development of Bicycle Facilities (the Bike
Guide): guidelines for bicycling facilities
- TRB, Highway Capacity Manual (HCM): computations for road
facility capacity and quality of service
- VDOT engineering design manuals: Virginia-specific guidance
- County/City standards: standards and requirements that may
differ on a local basis
- AASHTO guidance is for lanes of 10 to 12 feet in width. The
VDOT standard design is 11 or 12 feet depending on the design
speed and amount of truck traffic. In some locations, local
roads have 10-foot wide travel lanes.
If minimum standards or guidance cannot be met, it may be possible
to obtain a design exception or variance at the local level.
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Guide for Reviewing Public Road Design and Bicycling Accommodations for Virginia Bicycling Advocates