Its dangerous to say the least. I don't know how to say "stay in your car" or "turn off your engine" in 20 languages.
My friend was nailed for speeding in Korea. He tried the "hands up in wonderment - know no Korean" act. The policeman proudly proclaimed in well rehearsed english "Please follow me to the station". Probably the only english he knew. My friend had to backtrack about 20 miles to the station. Now he wishes he had played the "I am sorry" act and just signed the ticket and worried about how to deal with it later.