The gyratory and flyover
The gyratory is multi-lane, one-way and continuously busy, which has two consequences. A stopped vehicle causes disruption almost immediately, and a recovery vehicle that approaches from the wrong side has to go all the way round again.
The flyover above it has no hard shoulder. As with Chiswick, if you are stopped on it the priority is getting away from the carriageway, not staying with the car.
