More big rigs and commercial vehicles are more often seen at night this is the traffic pattern which is observed at night
Explanation:
During the day time cities experience peak traffic due to school vehicles, employee’s vehicles and motor cycles. If big rigs and commercial vehicles run at the same time the city will experience a heavy traffic.
Due to this reason the big rigs which are used to carry the goods and products to industries and the commercial vehicle which is used to carry people from one city to another city is most often seen more at night times.