Traffic is moving on a 6-lane dual carriageway road (3 lanes per direction). Traffic volume per direction during the peak hour (08:00 am to 09:00 am) is 6000 veh/h, distributed uniformly across the lanes in each direction. Just at 08:00 am, a truck goes out of order on the middle lane of one side, disrupting traffic on that lane. The lane capacity under normal conditions is 2000 veh/h/ln, and under queue formation it is 1600 veh/h/ln. The traffic resumes at 08:30 am on removing the truck from the middle lane. Hourly traffic volume after 09:00 am reduces to 5000 veh/h/dir. The number of vehicles in the queue at 10:00 am is ______ (in integer).