On-Demand Crossings: How Push-Activated Signals Are Improving Pedestrian Safety
Pedestrians at signalized intersections regularly experience an annoying and sometimes hazardous reality—waiting through long signal cycles with no vehicles in sight, or getting insufficient crossing time when traffic is heavy. Baseline timing plans, which are based on average conditions, typically do not represent the true demand at a given intersection at any given time. “Push-activated” pedestrian signal systems address this disparity directly by allowing pedestrians to have a say in when crossings are activated, while traffic controllers are still able to distribute signal time based on actual, real-time demand as opposed to coded assumptions.
Problems with Fixed-Timing Traffic Signals
Fixed-cycle signal systems run on preset schedules that cycle on and off continuously, with or without pedestrians or vehicles present. During non-rush hour times, pedestrians watch full vehicle signal cycles go by at empty intersections, delays that have no function in traffic control and that invariably push pedestrians toward non-compliance.
Mismatch between pedestrian demand and signal timing leads to a secondary problem. A pedestrian who comes to the signal across the street from where the signal cycle began may have to wait for almost one full cycle before the signal dictates that s/he should cross – a waiting time that has “nothing to do” with the traffic conditions at that intersection and that deteriorates trust in the system’s reactivity.
At intersections with sporadic foot traffic – transit stops, event venues, school zones – fixed timing is powerless against sudden surges in demand. Ten and two hundred pedestrians are offered the same crossing window, leading to either dangerous crowding when demand is high or needless vehicle delay when it is not.
How Push-Activated Systems Improve Crossing Safety
The availability of on-demand signal activation (see Hagar et al., 2010) greatly alters the relationship between pedestrian occurrence and signal response. Instead of waiting for a pre-set phase to come, pedestrians submit a crossing request that the controller treats as a priority in the current signal cycle — decreasing wait times and eliminating the feeling that the system ignores pedestrian presence.
Timing accuracy is better with activation data. Concerning pedestrian phases, those who know a crossing has been requested can provide an adequate phase length, increase walk intervals in the presence of several indications that may suggest a large pedestrian volume, and omit crossing time when there is no such indication.
A well-designed crosswalk push button also provides tactile and audible feedback that a request has been registered — removing the uncertainty that causes pedestrians to cross prematurely when they are unable to tell whether the system has sensed them. That feedback loop, between user and system, is a relatively minor, but measurable, contributor to crossing compliance rates.”
Benefits for Traffic Flow and Urban Efficiency
Vehicle flow efficiency benefits immediately when pedestrian phases are demand-actuated, rather than run on predetermined schedules. Intersections with pedestrian crossing phases that require activation by a user reduce unnecessary vehicle delay during times of low foot traffic — this can be compounded when applied to multiple intersections along a corridor.
System responsiveness is the human interface of pedestrian trust in signal infrastructure. When a crosswalk push button generates a consistently expeditious response, pedestrians are more likely to wait for their assigned crossing phase rather than ignoring the signal — increasing compliance without enforcement.
Synchronization of pedestrian-activated phases with neighboring signals’ timing can benefit from the provision of pedestrian crossing demand data as part of the wider network optimization, considering pedestrians as a signal coordination input, rather than a vehicle flow disruption.
Conclusion
Push-button actuation of pedestrian signals is a feasible and well-documented enhancement to the fixed-cycle option. Since they synchronize crossing phases with real demand, they minimize unnecessary stop time, enhance compliance, and facilitate better overall coordination between intersections. With cities around the world searching for infrastructure solutions to effectively serve all road users, on-demand crossing technology has a proven track record for delivering improvements in both safety and efficiency with simple requirements for implementation.
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