California highway speed limits are automatically 65 unless authorized to increase up to 70 miles per hours on designated areas.
“We want everyone to be traveling at about the same speed. Because when you have less differential of speed you have less potential of a conflict,” said District 6 Maintenance Operation Deputy John Liu.
He says Caltrans works with CHP and looks at the designs of roadways to determine the speed limit.
“We have concerns about sight distance when you drive faster than that, so our highways are not designed for anything higher than about 75 or 80 miles per hour,” Liu said.