I rarely go slow enough for anyone to tailgate me. In traffic, I haven't noticed it being an issue. I ride a bike most of the time, where I am extremely aware of and intolerant of tailgaters. If someone is following too close, I tap the brake a couple of times to indicate they should back off. If that doesn't work, I wave them back with my hand. If that doesn't work, I slowly come to a stop then put the kickstand down. That has always worked.

One reason I rarely get tailgated is I am always aware of what other people around me are doing. If someone wants to go faster than me, I get out of their way.