Metro

Boston’s 25 mile-per-hour default speed limit takes effect Monday

A Street in South Boston.
Bill Brett for The Boston Globe
A Street in South Boston.

The default speed limit in Boston will decrease to 25 miles per hour on Monday in an effort to create safer roads and reduce the number of traffic-related deaths.

The speed limit, which was previously set at 30 miles per hour, will not apply to state-owned roadways or to other locations with posted signs, the mayor’s office reminded drivers in a statement on Friday.

In places without a speed limit sign posted, the speed limit will be 25 miles per hour.

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“Reducing the default speed limit will create safer roads for all, and I’m pleased our hard work and commitment to safer roads has created this new standard,” Mayor Martin J. Walsh said in the statement.

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Walsh said the reduced speed limit brings Boston a step closer to its goal of eliminating traffic-related deaths by 2030.

Slower speeds give drivers more time and visibility to stop when they see a pedestrian in a roadway, the mayor’s office said. The likelihood of a pedestrian dying after being hit by a vehicle is reduced from 20 percent to 12 percent when the speed of the vehicle decreases from 30 miles per hour to 25.

“No one wants to be involved in a serious traffic crash, and slowing down vehicles can help to keep us all safe from harm,” Boston Transportation Commissioner Gina N. Fiandaca said in the statement. “People who drive, walk, and ride a bike in Boston are all asked to be aware of others sharing the roadway and to travel on our streets with caution.”

Felicia Gans can be reached at felicia.gans@globe.com. Follow her on Twitter @FeliciaGans.