You are assuming a fully observable environment - where everything is visible. To be honest with you, many bikers are not, or not from every angle possible. Mos

You are assuming a fully observable environment - where everything is visible. To be honest with you, many bikers are not, or not from every angle possible. Most of the bikes I have encountered do not follow the road signs either (especially lights & stop signs - they just breeze through). With this in mind, given cyclists are the ones in danger (As opposed to the driver sitting in his car), it's safer to give the cyclist a clear sign of a right turn. I have seen way too many times where a cyclist used his judgement to pass through a car in what i call rather dangerous way, so I rather block their path to save their life than to trust them to use their best judgement. Cyclists are often invisible, and more susceptible to injuries, and I am being cautious and not leaving any doubt about when and how I will turn, by blocking the path. When I give a right turn sign, you just cannot pass through me assuming i won't be turning in the next second.