Thanks to a new bill that went into effect in California on January 1, 2024, bicyclists will now enjoy greater safety from motor vehicles. At least, they will in theory.

The bill, titled California Bill A.B. 1909, states that bicyclists in the state are now permitted to cross whenever pedestrians are. This is an important development thanks to a technology called Leading Pedestrian Interval, or LPI, which gives walkers a head start on the right-of-way before traffic is allowed to commence.

In other words, signals that detect traffic in California are built to give pedestrians an extra three to seven seconds before any light in the intersection turns green, making pedestrians more visible to vehicle traffic. Several studies show that this seemingly minor head start can have major ramifications on the safety of pedestrians.

One 2016 study showed that the intersection in San Francisco that had the highest number of pedestrian injuries from left-turn incidences saw that number drop to zero once that intersection was armed with LPI functionality. Another study, performed in 2008, showed the LPI can reduce pedestrian strikes by more than 46 percent.

Before A.B. 1909 was passed, LPI applied only to pedestrian traffic. Cyclists had to abide mostly by motor vehicle traffic laws (as is the case in many cities around America).

But now, thanks to A.B. 1909, as cyclists are allowed the same head start pedestrians get, the hope is that there will be less vehicular strikes. In fact, in many cases, three-to-seven seconds will provide enough time for a person on a bike to completely clear an intersection, which, according to a study by the New York City Department of Transportation, is one of the most dangerous places for bike riders in urban settings. That study pointed out that 89 percent of cyclists involved in vehicle crashes in the city were struck at intersections.