|Authors:||Alena Katharina Høye|
|ISBN (digital version):||978-82-480-1613-7|
Signalized intersections have on average lower crash risk and fewer serious crashes than other at-grade intersections, but more rear end collisions. Road safety effects depend on various characteristics of traffic signals. Protected left turn phases can reduce collisions between left-turning and oncoming traffic. Right turn on red increases collisions between right turning vehicles and crossing pedestrians. Increased all-red intervals and advance warnings of signal changes were found to reduce side collisions. Adaptive signal control and coordinated signals (green wave) improve safety as well, but are mainly used to reduce travel times.