Note of caution about following the lead of semi-drivers, don't,
They push it to the limit, and often far past.
I have heard of too many instances of them driving too fast in blizzards, either hitting the rhubarb themselves, or running others off the road.
We were almost killed by one driving way too fast in horrible conditions on a narrow two-lane mountain road.
Just the other day I was watching one coming toward me, crossing over the center line. He looked up from his cell phone just in time to get back in his lane and catch my digital salute.
Most are fairly courteous, but enough are outright dangerous to make me wary of every one.