Note: This article is only relevant to link network structures in TRANSYT (all versions).
The first thing to remember is that queues are not ‘per lane’. The way to consider queue lengths in a master-shared link combination (aka ‘link share’), and indeed all the data in the final output table, is as a single link. Hence, if a queue is output as being 10 (and the same value will appear for the master and shared links) then the queue is 10 over the combined links: if the link represents one lane, the queue will be 10 per lane, if two lanes are modelled, the queue will be 5 per lane, etc. It is a key to using TRANSYT that the master link and shared link(s) are NOT used to model lanes separately. The reason for using master and shared links is to allow cyclic flow profiles to be kept separate – for roundabouts this is to keep O-D movements intact.
In the TRANSYT output the queue associated with a ‘link share’ is repeated on each of the shared links. In the Network diagram (aka NetCon) it was decided to display the queue just once and position it on the major link, since there will only ever be one major link defined (for a ‘link share’).
Additionally, In TRANSYT 13 or later, the repeated values associated with minor shared links are shown inside brackets to remind users that they are NOT to be added together to give a total queue length. – They ARE the total.
(Updated April 2025)