Contributor TG sends in this photo from 08:17 this morning on the junction of nine-tree-hill and and Stoke's Croft. Looks like the car went into sledge-mode and just slid down the hill, going over the kerb to stop people contraflowing, and then down the final stretch before coming to a halt into the one-way sign. Hope they were OK and that nobody was walking up at the time.
As someone who regularly contraflows this road on a bike, I find the one-way kerb setup and signage inconvenient, and must be pretty bad for any pedestrian trying to get a wide pushchair up here to find a one-way sign in the middle of the pavement. Today, when the alternative stopping facility would have been traffic in Stokes Croft, the sign came in handy.