The idea behind “shared space” street design is that less can be more. By ditching signage, traffic lights, and the grade separation between sidewalk and roadbed, the shared space approach calms traffic and heightens communication between drivers, pedestrians, and cyclists. Instead of following traffic signals on auto-pilot or speeding up to beat the light, motorists have to pay attention to their surroundings.
Shared space design has been shown to calm vehicle traffic and allow more freedom of movement for pedestrians with no increase in traffic injuries. A new study from professor Norman Garrick and Benjamin Wargo at the University of Connecticut finds that in the right conditions shared space also makes intersections more efficient for both pedestrians and motorists.
The study examined six sites around the world that have some degree of “shared space” and where each approach to the intersection has one lane of motor vehicle traffic. Because of the limited number of shared space designs in the U.S., only one American example is included: Uptown Circle in Normal, Illinois.
Using video, the researchers measured driver speeds and pedestrian and vehicle delay. The authors then compared those observations to computer-simulated estimates of how much delay would occur if the streets were designed with more conventional traffic control measures, like stoplights or roundabouts.
They found that in this context, shared space design calmed traffic while also creating less delay for both pedestrians and motorists than traffic signals.