  Optimizing the maintenance operation start time can greatly reduce the delays
caused by the maintenance operations. A real-time traffic status data
acquisition method based on real-time traffic map was first proposed, and then
a method that can convert real-time traffic status into real-time traffic
volume was put forward. Based on this real-time traffic volume data and the
classic delay calculation method based on queuing theory, the delays caused by
maintenance operations at different start time can be calculated and compared,
and therefore the optimal maintenance operation start time can be obtained. The
feasibility of the real-time traffic status data to real-time traffic volume
data conversion method and the feasibility of optimizing the maintenance
operation start time based on real-time traffic map data are verified by actual
cases.
