Method for constructing or updating routing tables for a modular conveying system for transporting transport goods to respectively allocated destinations (a1; a2), - the conveying system having a plurality of conveying modules (m1-m10) each having at least one inlet and at least one outlet, the transport goods being able to be transferred from an outlet of one module (m1-m10) to an inlet of a subsequent module (m1-m10), and different transport routes being able to be used to transport the transport goods; - each conveying module (m1-m10) respectively being assigned a module controller (s1-s10) for controlling the respective conveying module (m1-m10), the module controllers (s1-s10) being able to receive cost messages from module controllers (s1-s10) of immediately subsequent conveying modules (m1-m10) and being able to transmit cost messages to module controllers (s1-s10) of immediately preceding conveying modules (m1-m10), ▪ the cost messages comprising information relating to the costs at which at least one destination (a1, a2) of the conveying system can be reached from the respectively transmitting conveying module (m1-m10), and ▪ the transmission of cost messages respectively being delayed by the transmitting module controller (s1-s10) by a period which is proportional to the proportion of a local cost value of the module (m1-m10) in a respectively transmitted cost value, in which the module controller receiving a cost message, if it is assigned to a conveying module (m1-m10) having at least two outlets (s1-s10): - constructs or updates a routing table on the basis of the transmitted cost values, which routing table can store, for all outlets of the respective conveying module (m1-m10), information relating to those destinations (a1, a2) of the conveying system which can be reached from there at what costs, and after receiving a cost message from a subsequent module, transmits its own cost message to predecessor modules only when the updating of the routing table, which is carried out on the basis of the received cost value, results in a change in the most cost-effective transport route for a destination. - the conveying system having a plurality of conveying modules (m1-m10) each having at least one inlet and at least one outlet, the transport goods being able to be transferred from an outlet of one module (m1-m10) to an inlet of a subsequent module (m1-m10), and different transport routes being able to be used to transport the transport goods; - each conveying module (m1-m10) respectively being assigned a module controller (s1-s10) for controlling the respective conveying module (m1-m10), the module controllers (s1-s10) being able to receive cost messages from module controllers (s1-s10) of immediately subsequent conveying modules (m1-m10) and being able to transmit cost messages to module controllers (s1-s10) of immediately preceding conveying modules (m1-m10), ▪ the cost messages comprising information relating to the costs at which at least one destination (a1, a2) of the conveying system can be reached from the respectively transmitting conveying module (m1-m10), and ▪ the transmission of cost messages respectively being delayed by the transmitting module controller (s1-s10) by a period which is proportional to the proportion of a local cost value of the module (m1-m10) in a respectively transmitted cost value, ▪ the cost messages comprising information relating to the costs at which at least one destination (a1, a2) of the conveying system can be reached from the respectively transmitting conveying module (m1-m10), and ▪ the transmission of cost messages respectively being delayed by the transmitting module controller (s1-s10) by a period which is proportional to the proportion of a local cost value of the module (m1-m10) in a respectively transmitted cost value, - constructs or updates a routing table on the basis of the transmitted cost values, which routing table can store, for all outlets of the respective conveying module (m1-m10), information relating to those destinations (a1, a2) of the conveying system which can be reached from there at what costs, and