The 382 miles of I-95 running the length of the state have the worst rate of deadly accidents in the United States, while I-4 comes in third, the website calculated from five years of highway fatality data from the National Highway Traffic Safety Administration.
According to the analysis, there were 662 fatal accidents on I-95 in Florida from 2004 to 2008. That means there were 1.73 fatal crashes per mile.
The website said there were 209 fatal crashes on the 132-mile I-4 during the same period. That comes out to 1.58 fatal accidents per mile.
Florida Highway Patrol spokeswoman Sgt. Kim Montes was critical of the website's methodology, which she said does not look at how many vehicles travel the highways.
"You compare 95 in Florida with a road in North Dakota, and I think you're comparing apples to oranges," she said.
I-95 is the busiest interstate in Florida. And I-4 is likely the most congested interstate in Central and North Florida, Montes said.
"Thousands of drivers navigate that drive every day and never crash," she said. "Unfortunately, the majority of our fatal crashes are driver error."
Speed is a major factor in a lot of fatal accidents, Montes said. Some drivers exceed the speed limit by as much as 30 mph, she said.
"Maybe they feel like they're not doing anything wrong," Montes said. "But unfortunately, when you look at a common denominator [in fatal crashes] … speed plays a factor."
Steve Olson, a Florida Department of Transportation spokesman, said what makes I-4 and I-95 unique is the variety of drivers: local commuters, tourists and long-haul truck drivers.
He said his agency works with law enforcement and uses tools — such as the electronic, adjustable speed limit signs on I-4 — to help keep highways safe and flowing.
But a lot of times, people just feel as though they can drive faster than the speed limit, he said.
"The trick is to adjust people's behavior," Olson said.
Amy L. Edwards can be reached at firstname.lastname@example.org or 407-420-5735.