There is a chance of a patrol car pulling him over if they clock him. This is either driving, cycling, or walking.
They will believe he is out robbing or up to some kind of skullduggery.
Outward journey, he can lie and abort. Return journey he's fucked.
Visual wise if he encounters any pedestrians ( highly unlikely) there is a greater risk of an ID via walking or cycling.
Nobody will take much notice of a car going past if they are walking down a street. They'd had no reason to. They wouldn't believe that the person driving is on their way to massacre five people ( or on their way back from doing so) very doubtful a reg number would be memoriesd or even make of a car.
We're there industrial premises nearby? Who would be out and about in a small village in an affluent area in 1985 at that time? No pubs open, Maybe an insomnia sufferer walking his dog?
But logically speaking the only thing what would have clocked JB at that time would be foxes and cats.