Not on I-75 for the most part
For the most part, I find that they are more agressive. Especially the independent varieties. You'd think they'd be slowing to save fuel, but I think they've just gotten pissed their profit per load is dwindling. I'd bet the bigger companies will soon limit their drivers, for economy reasons.
Should the prices keep rising, you'll see some vendors turning to good ole' rail systems again. Cost per ton/mile will offset JIT deliveries. The JIT will be moderated by delivery re-scheduling. Everyone will pay whether in time or money.
I think speed restriction is a great primer to saving fuel, keeping costs low, and increasing safety. No one can challenge that it takes a good deal more reaction time and braking energy to avoid collisions at 75mph as opposed to 60mph. I can't believ they haven't gone there already.
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