Where do America's worst drivers live?

CSAIL spin-off crunches app data from 15,000 drivers to determine cities and states whose drivers brake the most, accelerate the best, and are most distracted by phones (among other things)

In April CSAIL researchers led the launch of EverDrive, an app aimed at improving people's driving by measuring habits like speeding, acceleration, hard turning, harsh braking and phone distractions.

This week the team from Cambridge Mobile Telematics (CMT) crunched three months of numbers to determine where America's safest and most dangerous drivers live, using data from 15,000 people driving approximately 18 million miles. Check out the results (and methodology) below:


America's most dangerous driving city: Jersey City, New Jersey
Jersey City drivers speed a lot compared to almost every other city, with nearly 25 minutes of speeding per 100 miles.
1. Jersey City, New Jersey
2. Pembroke Pines, Florida
3. Long Beach, California
4. Bridgeport, Connecticut
5. Yonkers, New York
6. Stamford, Connecticut
7. Santa Clarita, California
8. Elizabeth, New Jersey
9. Naperville, Illinois
10. Fontana, California
America's most dangerous driving state: Rhode Island
1. Rhode Island
2. New Jersey
3. Connecticut
4. New Hampshire
5. Hawaii
6. Massachusetts
7. New York
8. Maryland
9. Pennsylvania
10. Delaware
America's safest driving city: Billings, Montana

Billings drivers seem to hardly use their phone while driving, and outperformed the other cities in every measured category (except speeding, where they tied with users in Sioux Falls, South Dakota — only 1.3 minutes of significant speeding per 100 miles).

1. Billings, Montana
2. Tyler, Texas
3. Des Moines, Iowa
4. Brownsville, Texas
5. Anchorage, Alaska
6. Abilene, Texas
7. Lubbock, Texas
8. Kansas City, Kansas
9. Amarillo, Texas
10. Laredo, Texas
The safest driving state: Montana
1. Montana
2. Alaska
3. Wyoming
4. Vermont
5. North Dakota
6. Minnesota
7. Idaho
8. Kansas
9. Maine
10. Iowa
The city whose drivers get most distracted by their phones: Odessa, Texas
Odessa drivers were distracted by their phone for over 15 minutes per 100 miles of driving.
Runner-up: Fontana, California (13.7 minutes per 100 miles)
The region with the worst breaking & acceleration: Southern California

The worst 13 cities on hard braking and harsh acceleration are almost all in Southern California, including Long Beach, Pasadena and Riverside.
About EverDrive
Cambridge Mobile Telematics' (CMT) app applies machine learning and signal processing algorithms on sensor data to score users' driving quality. According to CMT, which developed the app with auto-insurance platform EverQuote, this is the first national driving study that uses smartphone telematics data. The team says that their findings correlate with Allstate's "2016 Best Drivers" report, which is based on actual insurance claims.
The team developed a scoring algorithm that captures a driver’s level of safety. The basic components of the DriveWell Score include harsh acceleration, hard braking, harsh cornering, excessive speeding, and phone distraction.
    •    The first three components measure abrupt changes in car motion, indicating aggressiveness, poor anticipation, or crash avoidance.
    •    Unsafe speeding is flagged when the driving speed is considerably higher (by a dynamic threshold) than the speed of the ambient traffic or the posted speed limit.
    •    Phone distraction measures how often the driver is using their phone while the vehicle is in motion.1