A traffic control system that comprises a navigation system for a manned vehicle (90, 130), which is configured to travel according to operation by an operator on one of plural lanes arranged side by side in a mine, and a traffic control device, which is adapted to perform traffic control of the manned vehicle, together via a wireless communication network; the traffic control device comprising: a travel-permitted zone setting section that is adapted to set a zone of the lane, on which the manned vehicle is traveling, as a first travel-permitted zone with a travel permission given to the manned vehicle only, an another-lane travel permitting section adapted to step, as a travel-permitted zone of another lane with a travel permission given to the manned vehicle only, a zone located on a lane adjacent to the lane, on which the manned vehicle is traveling, and including at least a part of a zone arranged side by side with the first travel-permitted zone, and a controller-side communication control section adapted to transmit to the manned vehicle information indicating positions of the travel-permitted zone and the travel-permitted zone of another lane; and the navigation system for the manned vehicle comprising: a command input accepting section configured to accept operation which makes a setting request for the travel-permitted zone of another lane on the lane adjacent the lane on which the manned vehicle (90, 130) is traveling, a display control section configured to display the travel-permitted zone of another lane on a screen, and a vehicle-side communication control section adapted to transmit the setting request to the traffic control device and receives the information indicating the position of the travel-permitted zone of another lane from the traffic control device, respectively; and a vehicle-side map information storage section adapted to store map information defining positions of the plural lanes and traveling directions of the respective lanes, wherein the navigation system is configured for operating as follows: if operation is performed on the command input accepting section to cancel the setting of the already-set travel-permitted zone of another lane when the traffic control device has set a zone of the lane, on which the manned vehicle (90, 130) is traveling, as a travel-permitted zone with a travel permission given to the manned vehicle (90, 130) only, and if the vehicle-side communication control section has received the information indicating the position of the travel-permitted zone, the command input accepting section is adapted to acquire a position of the own vehicle from a position calculating device mounted on the own vehicle, to refer to the position of the own vehicle and the map information, and to accept a cancellation request operation to cancel the setting of the travel-permitted zone of another lane only if the own vehicle has a body included in the travel-permitted zone and the body of the own vehicle is in a direction matching a traveling direction of the travel-permitted zone or if the body of the own vehicle is included in the travel-permitted zone of another lane and the direction of the body of the own vehicle matches a traveling direction of the travel-permitted zone of another lane. a travel-permitted zone setting section that is adapted to set a zone of the lane, on which the manned vehicle is traveling, as a first travel-permitted zone with a travel permission given to the manned vehicle only, an another-lane travel permitting section adapted to step, as a travel-permitted zone of another lane with a travel permission given to the manned vehicle only, a zone located on a lane adjacent to the lane, on which the manned vehicle is traveling, and including at least a part of a zone arranged side by side with the first travel-permitted zone, and a controller-side communication control section adapted to transmit to the manned vehicle information indicating positions of the travel-permitted zone and the travel-permitted zone of another lane; and the navigation system for the manned vehicle comprising: a command input accepting section configured to accept operation which makes a setting request for the travel-permitted zone of another lane on the lane adjacent the lane on which the manned vehicle (90, 130) is traveling, a display control section configured to display the travel-permitted zone of another lane on a screen, and a vehicle-side communication control section adapted to transmit the setting request to the traffic control device and receives the information indicating the position of the travel-permitted zone of another lane from the traffic control device, respectively; and a command input accepting section configured to accept operation which makes a setting request for the travel-permitted zone of another lane on the lane adjacent the lane on which the manned vehicle (90, 130) is traveling, a display control section configured to display the travel-permitted zone of another lane on a screen, and a vehicle-side communication control section adapted to transmit the setting request to the traffic control device and receives the information indicating the position of the travel-permitted zone of another lane from the traffic control device, respectively; and a vehicle-side map information storage section adapted to store map information defining positions of the plural lanes and traveling directions of the respective lanes,