The Los Angeles Department of Transportation (LADOT) has adjusted traffic signals across the city to help prevent speeding on emptier roads.

According to LADOT, it operates the most advanced signal synchronization system in the world. Typically, signals are coordinated automatically to help ease traffic congestion and help move traffic through intersections. Now that fewer people are driving, drivers are getting “all green” waves of signals which, the LADOT says, tends to encourage people to drive faster than the speed limit.

“To encourage safer driving across the city, the Los Angeles Department of Transportation has adjusted signals across the City to ‘nighttime mode’,” stated LADOT.

In “nighttime mode” signals change to red when traffic volumes are low to prevent green waves of signals and to require people to go slower.