NORTHBROOK, IL - Drivers in Los Angeles and Philadelphia are among the most accident-prone in America, according to the results of Allstate Insurance Company's sixth annual "Allstate America's Best Drivers Report." The report ranks America's 200 largest cities in terms of car collision frequency to identify which cities have the safest drivers, according to Allstate claim data.

Drivers in U.S. cities with populations of one million-plus are more likely than the national average to experience a collision, according to Allstate. Among cities with a population of more than 1 million, Los Angeles and Philadelphia experienced the most frequent collisions at 6.9 years (L.A.) and 6.5 years (Philadelphia). In contrast, motorists in Phoenix topped the list in the category, making them the safest big city commuters.

Overall, Fort Collins, Colo., was ranked as the safest driving city. According to the report, the average driver in Fort Collins will experience an auto collision every 14.5 years, which is about 31 percent less likely than the national average. This is the first time Fort Collins has been ranked No. 1 on the list.

Auto crashes in general have declined over the last few years, but crash fatalities still average around an alarming 35,000 every year despite technological advances, according to the National Highway Traffic Safety Administration.

Click here to view the complete report or to see the previous year's results.