What are the sight distance requirements at roadway crossings?
A All trail/roadway crossings will be designed with the right-of-way assigned to the roadway and a STOP condition on the trail approaches. Two types of sight distance will be evaluated at each roadway crossing: Stopping Sigh Distance (SSD) defined as the distance required to bring a vehicle (motor or bicycle) to a full controlled stop. The SSD varies based on vehicle speed and grade of the road or trail. SSD will be checked at each crossing for both the trail and roadway approaches. Intersection Sight Distance (ISD) defined as the sight distance needed for trail users (pedestrians or bicyclists) to judge the suitability of gaps in on-coming traffic for crossing the roadway. The ISD varies depends speed of approaching traffic, crossing width and time, and crossing performance. The ISD will be checked at all roadway crossings.The extent of clearing required at each crossing to accommodate the sight distances will be calculated during the design process using the actual survey base plan a
