Good idea, just a shame that roads in the UK are often so narrow that 3' is often a high proportion of the road. God knows what Americans think when they experience them over here!
True story this: My daughter-in-law (American) on a recent visit to Britain with my son was so terrified of the cars, roads and speed of the traffic and being on the 'wrong' side of the road that she spent the entire 10 days of the road trip huddled in the back seat of their hire car afraid to even look out.