It’s no wonder that Boise, Idaho is one of the nation’s fastest growing cities: It boasts a thriving job market, breathtaking natural vistas and a buzzing brewery scene. Boise can also claim to have the nation’s safest drivers. According to Allstate’s America’s Best Drivers Report, released earlier this year, the average driver in the U.S. will experience a collision every 10.7 years, compared to every 13.7 years in Boise.

Allstate standardizes their rankings to level the playing field between drivers in densely populated areas and those in smaller cities. Allstate also determines safe cities to drive in by how weather affects road conditions, utilizing data to standardize average annual precipitation. However, many factors contribute to car crashes, including the number of cars on the road.

“Things like the layout of a city, its transportation network, traffic signs and lights, and law enforcement can all impact driving safety,” said Saat Alety, Allstate’s Director of Federal Legislative and Regulatory Affairs. “Different levels and types of traffic, noise, activity and varying road conditions and rules can make big-city driving different than driving in smaller or more suburban areas.”

The cities that landed on the bottom of the list are Los Angeles, Glendale, Worcester, Boston, Washington D.C. and Baltimore. In cities that rank lowest in safest drivers, there are roads that have been identified in the reports as particularly treacherous.

“America’s infrastructure is in dire need of an overhaul,” Alety said.

Allstate is offering $150,000 in grants that can be used for safety improvement projects on the 15 “Risky Roads.” The company is working with local safety experts to determine which projects will have a positive effect for motorists driving on these crash-prone streets.

“When you consider the impact a daily commute has on a person, it’s not hard to imagine how one small traffic improvement can be a positive change for many,” Alety added. “Our grants signal Allstate’s commitment to reduce risky conditions on America’s roads in communities across the country, but it’s just one piece of the puzzle. We need Congress to pass comprehensive infrastructure reform so we can rebuild a transportation network that ensures a safer future on the roads for everyone.”