The 4th of July is known for barbecues and fireworks, but according to the Insurance Institute for Highway Safety (IIHS), it’s also the deadliest day on the road.IIHS says drunk driving is a significant factor in vehicle fatalities on this American holiday, with 47% involving at least one driver with a blood-alcohol concentration of at least .08 - the limit at which drivers are considered legally drunk. The National Safety Council reports more than 38,000 roadway fatalities occurred last year – the highest count since 2008. Preventable human factors, like drunk, distracted and drowsy driving; speeding and failure to use safety features contribute to 94% of car cashes In an effort to boost the discussion about safe driving, Allstate is releasing its 12th annual Best Drivers Report. Some key findings include: America’s safest city overall is Brownsville, Texas. For the second year in a row, Boston came in last place ranking 200th out of 200 cities on the list. The 10 best cities on the list: Brownsville, Texas; Kansas City; Madison, Wisconsin; Cape Coral, Florida; Boise, Idaho; Huntsville, Alabama; Port Saint Lucie, Florida; Wichita, Kansas; Olathe, Kansas; Reno, Nevada The 10 cities at the bottom of the list: San Francisco; Philadelphia; Los Angeles; Providence; Glendale, CA; Springfield, MA; Washington, D.C.; Baltimore; Worcester, MA; Boston. Anchorage, Alaska is the most-improved city, jumping 58 places on the report. Detroit is 101st safest driving city. Sterling is 156. Those are the only two metro Detroit cities that made the list. Grand Rapids is 155. Phoenix continues to rank number one among American cities with a population of more than one million. At 45th place, Jacksonville, Florida ranks the highest among populations between 750,000 to 999,999. The report also analyzes the correlation between hard braking events and city drivers’ collision frequency: drivers in Madison, WI experience the least number of hard braking events in the country.