Concrete roads are usually light gray or white, while asphalt roads are dark gray or black, Flores said. To spot grooves on the highways, look for the straight lines etched in the concrete.

Grooves have been used on Texas highways since the late 1960s. ... Concrete roads are usually light gray or white, while asphalt roads are dark gray or black, Flores said.

Honeycutt said the grooves can do more than stop sideshows. “We really want to change how people use the roadways and by slowing drivers down, helping them think about how they are using the ...