They have neat little things that you can install in your kids' cars that has GPS awareness and can monitor speed and other parameters, and send txt alerts to your cell phone.
It's kinda ridiculous that it has to come down to that, but I'll bite.
Regarding truckers, many fleets have governed their trucks to 63 MPH to save fuel and wear and tear on the engines. I've hear estimates that the engines last up to 50,000 miles longer between rebuilds or major service just from slowing down from 75 governed top speed to 63-65 GTS.
You have to remember, though, that the original intent for GPS systems in trucks may have been better efficiency, but it also monitors things such as vehicle speed and miles traveled. If anything were going to make trucks more fuel efficient, you'd think that'd have been it. The GPS systems are kind of like someone breathing on your neck all the time, and yet, nothing comes of it.
One of my Uncles is a trucker, and I've taken his bob-tail rig down to pick up a semi-trailer that I bought... GPS recorded the miles, and he was never called on it. Almost 50 miles round trip, and they never said anything. Never even charged him the fuel surcharge for those 50 miles.
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