I’ve posted about the red light running epidemic: red light cameras and law enforcement; the end of red light enforcement; how do we get more red light cameras?; red light running consequences; SacCity red light cameras and crashes; Sac Vision Zero intersections & red light cameras; red light cameras; pandemic of red light running; and red-light-running bullies.

Of all the traffic violence occurring on our roadways, this is the one that concerns me the most. When one driver runs a red light and hits another driver going on the green light, the result is almost always serious injury and sometimes fatality. It is a particularly high impact crash because the driver running the red light is often accelerating into the intersection, because they have decided (consciously or not) that they are going to run the light, and want to get through as quickly as they can. T-bone crashes, which red light running crashes almost always are, are especially damaging.

The red light running epidemic started with the pandemic, in my observation, though it has always been present. I’ve seen multiple explantations of why this is, but the relative lack of cars on the road, and the resulting perception that the road belongs to the driver alone, is one common explanation. But as the pandemic has faded, red light running has not faded, it has increased month over month. If you observe any moderately busy intersection, you will see drivers run red lights on nearly every signal cycle. Other drivers, and people walking and bicycling, have responded to this lawlessness by not going on the green. People now expect someone to be running the red light, and pause until all the vehicles have stopped. Green lights and pedestrian signals were never a guarantee of safety, but now they are a guarantee of danger.

I have said before, and continue to strongly believe, that automated red light enforcement is the top solution to this behavior. I believe that most drivers would stop doing it if they were ticketed a few times. Some would not, or course, because there are drivers on the road for whom the cost of a ticket is meaningless, and their consideration of other people’s lives is nil. Such drivers will create a pattern of law breaking that can be identified and stopped by suspension of drivers license, and more importantly, confiscation of their vehicle. In my observation, most of the red light runners are driving high value cars. Tickets mean nothing, but loss of their expensive car will get their attention.

Red light running is the traffic violence issue probably least amendable to infrastructure solutions. It is a choice by drivers, and one not primarily induced by poorly designed roadways.

There are research papers from the 1990s through early 2010s that suggest changes to the signals to reduce red light running. Bigger and brighter signals. larger brighter reflective backplates around the signals (these have been common recently with the yellow reflective backplates). Changing the all-red interval to a longer period, or the yellow signal to a longer period, but drivers adjust to this and increase their risk behavior to compensate. Placing advance warning signing or flashing lights, more appropriate for rural situations than cities. I don’t believe that any of these have a significant impact. Horizontal rather than vertical placement of the signal heads may have some beneficial effect.

Moving signals to near-side locations of the intersection is the solution in many parts of the world. Near-side signal placing does reduce red light running because the driver is responding to the signal on the close side of the intersection, not the far side. Research supports this, but the US refuses to make this change.

And of course education, encouraging drivers to follow the law and to cease actions that endanger others. I’m pretty cynical about education. Education works when someone does not know the consequences of their behavior. But drivers do know the consequences of their red light running. They’ve gotten away with it so far, but I doubt that any of them think they will get away with it forever.

Redesigning roadways and intersections to create more friction, such as narrower lanes and curb extensions to slow drivers, reducing the energy of crashes, but neither prevent red light running. Protected intersections reduce the hazard for bicyclists and walkers, by better separating movements and shortening crossing distances, but they don’t prevent red light running.

Though research clearly supports daylighting for increasing visibility between drivers and walkers, it may also increase red light running because drivers do, or think they do, have a better view of the intersection and whether approaching vehicles are going to cause them problems. I’m all for daylighting, but this issue must be acknowledged.

I believe automated red light running enforcement is the most effective solution, but others should be considered in addition to, not in place of, automated enforcement.

I searched for but did not find any research or even preliminary information on red light running and solutions since the beginning of the pandemic. It is possible some is underway. It is not the sort of thing that would be funded in the current administration, but it might not be rescinded.