ok, I will do this thank you..
Finally you posted the code. It's normally better to post it in the comment rather than the original post as it can be confusing for anyone starting to read this thread. Anyway...
Does this ever get shown on the monitor ?
Serial.println("car want self-stop automatically ");
sorry but I am newed on Arduino.cc , yes it
s shown but it is complete driving after showing this ,I tried writing it in another method its never shown on the monitor or stop the car!