A subset of circular Bicyclists may ride intersections that Pedestrian crossings are in the roadway with feature yield control of Vehicles approaching located only across the vehicles or HCS, SIDRA with all entering vehicles, the intersection must legs of the roundabout, transition to US HCM Model Roundabout channelized approaches, yield to vehicles typically separated from paths via NCHRP 672 for designs not and horizontal curvature circulating within the the circulatory roadway bicycle ramps (if supported by and roadway elements circulatory roadway. by at least one vehicle present). Bike lanes HCS to induce desirable length. should not be used vehicle speeds. at roundabouts Drivers desiring to turn left from the major road onto an intersecting cross street must first travel through the signal-controlled intersection and then execute a U turn at the An intersection median opening Larger clearance Ride on street in CAP-X (planning treatment that downstream of the intervals are required for travel lane or level) eliminates direct intersection. These the side street signal bicycle lane (if turns at signalized drivers then can turn phase, and wider available), unless Synchro, Median intersections from major right at the cross street. medians are often used multi-use path is SimTraffic (MUT) and minor approaches to accommodate present. Design and replaces them with For drivers on the side Pedestrian techniques for VISSIM or similar u-turns on the major street desiring to turn crossings are often direct left are microsimulation street left onto the major road, available software they must first turn right at the signal controlled intersection and then execute a U turn at the downstream median opening and proceed back through the signalized intersection.
Roundabout A subset of circular intersections that feature yield control of all entering vehicles, channelized approaches, and horizontal curvature and roadway elements to induce desirable vehicle speeds. Vehicles approaching the intersection must yield to vehicles circulating within the circulatory roadway. Pedestrian crossings are located only across the legs of the roundabout, typically separated from the circulatory roadway by at least one vehicle length. Bicyclists may ride in the roadway with vehicles or transition to paths via bicycle ramps (if present). Bike lanes should not be used at roundabouts NCHRP 672 HCS, SIDRA with US HCM Model for designs not supported by HCS Median (MUT) An intersection treatment that eliminates direct at signalized intersections from major and minor approaches and replaces them with u-turns on the major street Drivers desiring to turn left from the major road onto an intersecting cross street must first travel through the signal-controlled intersection and then execute a U turn at the median opening downstream of the intersection. These drivers then can turn right at the cross street. For drivers on the side street desiring to turn left onto the major road, they must first turn right at the signal controlled intersection and then execute a U turn at the downstream median opening and proceed back through the signalized intersection. Larger clearance intervals are required for the side street signal phase, and wider medians are often used to accommodate Pedestrian crossings are often Ride on street in travel lane or bicycle lane (if available), unless multi-use path is present. Design techniques for direct left turns are available CAP-X (planning level) Synchro, SimTraffic VISSIM or similar microsimulation software
19310.003%20-%20PennDOT%20ICE%20Policy%20-%208th%20Draft.docx