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I had something similar happen the first proper ride I went on in the UK, except I was already nearly past the car when it pulled out into the roundabout so no time to rev bomb or anything (they would have probably hit my rear wheel side on). They seemed to suddenly realise and slammed the brakes and just missed me. I've never had anything like that happen on a push bike, does make you feel incredibly vulnerable.
By the way, case and point was:
First, pinning it off the traffic lights, cruising at legal speeds, no issue at all. Taking the aggressive line I could see clearly the road ahead and both sides at junctions.
Then, having chilled and taking it steady around a roundabout, someone nearly drives full-on into the side of me. That is even though my road position is clearly banking around the tightest point. Anticipating it I was already balancing and revbombing ready to step off the bike if she didn't stop. The second incredibly loud rev she actually looked at me and stopped.
So that's the risk. Going fast isn't the issue, it's the 30-4omph solid vehicle impacts that has me nervous. One kneecap is already wonky after being clipped by a car when cycling, I'd like to avoid it happening twice.