If you're still in gear and still coasting, the engine is turned over by the wheels turning it. What decides if an engine 'is running' or not, is debatable, but I'd say if its turning round then its running. When you reach lower speeds, fuel is then injected. The engine does not need restarting, because it is being turned round the whole time, exactly the same as the starter motor does.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black