Few days back I had similar experience when i was going towards Naupada Police station from Hariniwas circle , there was traffic in opposite lane so a lady decided to travel into my lane (Road has least 2-3 feet high dividers) and then join opposite lane at circle
. at first i thought she must be looking for parking hence i slowed down to 5-6kmph but soon i realized that she is looking for exit at circle, So i rushed and stopped my car barely 6" away from her i10 and got out , locked my car and told her to wait for 1-2hrs as i've to do shopping and since she is blocking whole lane i've no choice but to leave my car at the spot and walk towards market area
. After 5-10sec lady agreed to reverse her car into correct (opposite)lane
and without any drama i was on my way to shopping after she reversed her car .
I think this is the only logical way to treat such people , If they are blocking your lane just park there and wait untill they backed out or call 100 .