It won't surprise motorists who regularly endure the crawl along one of Sydney's most congested roads near Olympic Park.

But the most notorious spot in the state for motorists to merge into other traffic is only several hundred metres from what has already been dubbed Sydney's worst roundabout.

The intersection of Homebush Bay Drive and the M4 motorway has claimed top spot on the list of merge locations on NSW roads where vehicle collisions most frequently occur.

In fact, the top four spots for collisions from vehicles merging are located along the M4, data of claims from NRMA Insurance shows.