Next time you're at a yield, be it an on ramp or off ramp or whatever, please look to see that the truck coming doesn't have a trailer attached. I've been driving a diesel 3500 dualie for awhile now with a 30 ft trailer, and I find it incredible the people who don't notice the trailer attached with bright colored swing sets. I waited two hours in queens ny today for a cop to come do a police report cause a guy "didn't notice" a 30ft trailer.
Please be safe on the road and remember that the truck with trailer can't always just change lanes to make room for you