Driving to Cambridge

I dream that I am going back to Cambridgeshire. I am driving. I’m trying to park on a residential road. My Nan is in the car with me. She looks pleased and happy. I’m having difficulty parking so I decide to keep driving. It is raining. I don’t think my breaks are working very well. I hit the back of one car (which is stationary by the side of the road). The car is swerving about a lot, I think I’ve forgotten which is the break and which is the accelerator.