I would not call it road rage per say because i am not the middle finger type of person but my blood pressure rises - dont it just annoy you when people cruze in the left lane!!?
In the US: right lane is for cruising, left lane is passing. but I get what you mean. Doesn't bother me as much as people who don't move over or slow down to allow you to enter the freeway. As if being in FRONT of me is somehow an earned right.