Hiya, I'm new here, so be gentle with me!
I noticed a few comments from some on this thread saying they didn't suffer tailgating much, and offering some thoughts as to why....
Personally, I think much depends on what kind of car you're in! I drive a Smart car (heheheh) get tailgated a lot. But step into my other half's 4x4 and I get left alone - even though I'm travelling at the same speed as I would have in the Smart!!
The Smart is a classic example of how other, beefier cars will attempt to "bully" others out of their way though - AS WELL as tailgating, I suffer hugely in the Smart from undertaking, and hugely dangerous maneuvres *just* to get ahead of me at ANY cost - and I'm not a slow driver, nor is my car an unresponsive car (It's been tuned). I think perception is "oh, that's a slow car, must get ahead of it" and then some strange primal desire to leave me in the dust takes over - which is fine, as long as you don't have to drive like a total arse to achieve that!!
I have seen (I hate to name and shame, but it seems especially to be Astra and BMW owners) many, many incidents in 3 years of driving a Smart where bigger cars have literally, nearly killed themselves, or others, simply to patch a dented ego - where I have left the lights quicker than them, or got ahead of them somehow, and they feel they must redress the balance.
It seems to me that many cases of tailgating are about the driver behind feeling he has more right to use the road unhindered than I do, and that these rights are defined by bhp or engine cc.