Merge onto the highway like you mean it. The on ramp is there for one reason: to allow you to accelerate to highway speed. Use the gas pedal and get up to speed. Don’t just creep down the on ramp. Remember, there are likely people behind you who are trying to speed up to 65 mph as well. If you do manage to get into the highway at a rate of speed that’s too slow to keep up with traffic, you’re just going to cause a logjam behind you.
Merging: Remember, the highway traffic has the right-of-way. It’s not their responsibility to let you in, and they’re probably not going to. Be decisive, pick your spot, signal and merge in. Don’t be too aggressive, but this is NOT the time for passivity. Once you’ve merged, if you’re on a highway with three or more lanes, go ahead then and get out of the right lane, allowing other people to merge easier at other interchanges. Besides, if you’re driving like you’re supposed to, the right lane’s probably moving to slow anyway.