I'd love to know which side is lying.

From the BBC:

The police statement said that at about 13:25 BST on Saturday officers from the Territorial Support Group “witnessed a vehicle with blacked-out windows that was driving suspiciously, including driving on the wrong side of the road. They indicated for it to stop but it failed to do so and made off at speed. The officers caught up with the vehicle when it stopped on Lanhill Road. The driver initially refused to get out of the car.”

Williams, the fifth-fastest British woman in history over 200m, and Dos Santos said that a written report given to them by police did not mention driving on the wrong side of the road, and that where they stopped is a single car-width road.

Inconsistency 1

Williams and Dos Santos say they were stopped because they are POC. I have no doubt that this happens more often than it should, but you can’t work backwards and say that every time a POC is stopped, it’s because of institutional racism. White people get stopped as well.

The police say that the car’s windows are blacked out. If true, the police wouldn’t be able to tell what the people in the car look like, which rules out institutional racism as a reason for stopping them.

Inconsistency 2

Dos Santos emphasises that the road on which they actually stopped is single car width. This appears to be undisputed.

However, that is not the question. The question is, how wide is the road on which they were initially flagged down?