A transport system comprising: a plurality of transport vehicles that are adapted to travel along a track (TA;TA1); and a controller (TC;TCA) that is adapted to control a transport vehicle, wherein the controller (TC;TCA) is adapted to assign normal transport instructions comprising an instruction for the transport vehicle to pick up an article at a pickup port and travel from the pickup port to an unloading port (PT1;PT2;PT3) along a travelling route and to unload the article at the unloading port (PT1;PT2;pt3); characterized in that the controller (TC;TCA) is adapted to obtain closure information related to closure of the travelling route and to assign a normal transport instruction to the transport vehicle only if the traveling route for the transport vehicle from the pickup port to the unloading port (PT1;PT2;PT3) can be secured on the track (TA;TA1); the controller (TC;TCA) is further adapted to assign a first special transport instruction to cause the transport vehicle to pick up the article at the pickup port and travel to a specified point (P1;P2;P3) on the downstream side of the pickup port in a traveling direction of the transport vehicle at which a traveling route can be secured on the track,instead of a normal transport instruction, in a case where the traveling route for the transport vehicle from the pickup port to the unloading port (PT1;PT2;PT3) designated by the transport instruction cannot be secured on the track (TA;TA1), and the controller (TC;TCA) is further adapted to assign a second special transport instruction to cause the transport vehicle to travel from the specified point (P1;P2;P3) to the unloading port (PT1;PT2;PT3) and to unload the article at the unloading port (PT1;PT2;PT3), in a case where a traveling route from the specified point (P1;P2;P3) to the unloading port (PT1;PT2;PT3) can be secured at the point in time at which the transport vehicle approaches or reaches the specified point (P1;P2;P3) based on the above-described closure information. a plurality of transport vehicles that are adapted to travel along a track (TA;TA1); and a controller (TC;TCA) that is adapted to control a transport vehicle, wherein the controller (TC;TCA) is adapted to assign normal transport instructions comprising an instruction for the transport vehicle to pick up an article at a pickup port and travel from the pickup port to an unloading port (PT1;PT2;PT3) along a travelling route and to unload the article at the unloading port (PT1;PT2;pt3); characterized in that the controller (TC;TCA) is adapted to obtain closure information related to closure of the travelling route and to assign a normal transport instruction to the transport vehicle only if the traveling route for the transport vehicle from the pickup port to the unloading port (PT1;PT2;PT3) can be secured on the track (TA;TA1); the controller (TC;TCA) is further adapted to assign a first special transport instruction to cause the transport vehicle to pick up the article at the pickup port and travel to a specified point (P1;P2;P3) on the downstream side of the pickup port in a traveling direction of the transport vehicle at which a traveling route can be secured on the track,instead of a normal transport instruction, in a case where the traveling route for the transport vehicle from the pickup port to the unloading port (PT1;PT2;PT3) designated by the transport instruction cannot be secured on the track (TA;TA1), and the controller (TC;TCA) is further adapted to assign a second special transport instruction to cause the transport vehicle to travel from the specified point (P1;P2;P3) to the unloading port (PT1;PT2;PT3) and to unload the article at the unloading port (PT1;PT2;PT3), in a case where a traveling route from the specified point (P1;P2;P3) to the unloading port (PT1;PT2;PT3) can be secured at the point in time at which the transport vehicle approaches or reaches the specified point (P1;P2;P3) based on the above-described closure information.