It really sucks....
Once I was minding my own business, cycling to work, and moved to overtake a much slower rider. With nay so much as a look or signal they abruptly crossed straight in front of me. My front wheel clipped her rear wheel and it was Oooh! what was that funny bump? for her and a quick visit to the tarmac for me. Luckily no damage done.
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Get a bicycle. You will certainly not regret it, if you live.