From a Letter to the Editor in today's ' Daily Ireland': "I hope that Mr. X was not one of the Northern Irish drivers caught speeding as all of them seem to think that mph is the same as km/h." That should mean. for instance, that they drove at 100 mph when they saw a sign saying 100 km/h. The addition km/h is their undoing as they cannot claim they didn't see what the sign meant.
