Road Block!

On the motoray today and suddenly find myself behind  a police car slowing the traffic down and eventually stopping it. There must have been  a problem up ahead but we did not know whtat it was.. We were still for about 15 minutes  on  a very busy motorway!  I think there was  a queue about a mile long behind us!! Eventually the flashing don't pass went off and we were allowed to continue!  I hope all the traffic behind us did not think it was me!!!