I have seen many long slow trains and by slow I mean walking pace take ages to clear the crossing, several times for what ever reason they have stopped totally blocking both crossings for 15 minutes or more. I also saw a tamper or grader that activated the crossing and came to a stop just past, while the barriers stayed down the operator got out and spent several minutes doing something, this meant all the cars seeing this went round the down gates. Also the NS maintenance guy comes along and tests the crossing regularly lowering the barriers and walking round to check the lights. I have seen cars go round the barriers while this is happening. In the UK both of these jobs would require two persons to avoid just that situation. I think there is a mindset in vehicle drivers that the crossing barriers don't always mean a train is approaching, and if it is it will be long and slow. Not sure there is anything that can be done, but the rail roads need to make sure they don't cause drivers to have the wrong perceptions, currently from what I have seen they are not helping