The M4 starts six miles west of central London where the A4 merges into the M4 on a raised flyover. (The A4 continues in its own right below the flyover.)
Junction 1 (restricted access): A205 South Circular, A406 North Circular, A315 Chiswick, A4.
... once the player has gotten through a level there are bonuses to collect, record times to beat, and a gold star for getting through the level without any ...