[Coaster]

I use a blue tooth to make calls and voice text during my 30 min each way commute. I'm on a toll road doing 80+ for 30 mins, I can use cruise most of the time. Hardly any turns and mostly light but getting worse every year traffic. When I first started using the toll road the limit was 70 and you could drive with your eyes close and just stay between the dummy dots. Each year more and more people are willing to pay to stay off the parking lot aka I35. Recently they raised the limit to 75 and then to 80 to attract more people. That was ok even if it increased traffic because just about everyone was doing the same speed. The worst change was when they lowered the toll for semi- trucks. They "only" do 60 or 65. I don't know if it's for fuel economy or related to amount of time they can drive but they cause the worst traffic. If you get one doing 62 passing one doing 60, traffic backs up and takes miles to unwind and cause extreme frustration for several drivers. I don't think "mixed" speed limits would work well with a moderate amount of regular traffic. Maybe on the open roads in West Texas it could work but I can't see it working on I35 at anytime between San Antonio to the North Texas border.