Janet Tyson Prosser said Friday morning that the black tire marks outside her Anniston shop on U.S. 431 are all the evidence she needs that more should be done to make the highway safer. “I’m the one who calls 911,” Prosser said. “I’ve called them several times after accidents here.” … David Brown, a professor at the Center for Advanced Public Safety at the University of Alabama, in a phone interview Friday, said the average daily traffic count of a roadway is the most critical factor in predicting the frequency of crashes. “Double the number of cars out there and you double the chances of any one of them running into another or their running off the road and hitting something,” Brown said.