10.2 Acceptable Gap Distance Motorists turning from a minor road onto a major road will not make a turn until they observe an adequate gap in traffic on the major road. Acceptable gap distance is the size of gap that provides motorists enough time to stop and complete...
10.8 Sight Distance at Left-Skewed Intersections When a vehicle crosses a major road from a left-skewed minor road, the motorist’s line of sight is obstructed by portions of their vehicle (e.g., roof posts, door frames). AASHTO recommends that intersection skew not...
30.12 Roundabout Lighting Lighting is an essential navigational aid and should be used at every roundabout so motorists can safely drive them at night and other periods of low visibility. Partial lighting is better than no lighting. In areas where installing a power...
30.10 Countermeasures for Improving Accessibility for Vision-Impaired Pedestrians at Roundabouts Compared to pedestrians with no vision impairments, pedestrians who have vision impairments typically have longer wait times at roundabouts because they are unable to take...
30.8 Accommodations for Bicyclists at Roundabouts Roundabouts have lower crash rates than conventional intersections, but they can see more bicycle crashes than four-legged intersections. Applying one or more of the following countermeasures will enhance bicyclist...
30.6 Guide Signing at Roundabouts Many motorists remain unfamiliar with roundabouts and how they are supposed to navigate them. Installing signs that provide clear guidance on the direction of travel is imperative. For multilane roundabouts, signs need to contain...
