TRANSYT 16 and TRANSYT 17:
Bonus greens can be modelled using one of two methods:
Method 1: by changing the phased-based “relative start displacement” or “relative end displacement” values in order to differentiate between ‘actual’ green time and ‘effective’ green time. Within the TRANSYT model, these values ‘combine’ with the network wide start and end displacement values – which are often set to 2 seconds and 3 seconds respectively. “Relative start displacement” and “relative end displacement” values can be either negative or positive, and are specified as part of the PHASE DATA.
Method 2: by changing the traffic stream-based “Green start adjustment” or “Green end adjustment” values in order to differentiate between ‘actual’ green time and ‘effective’ green time. Within the TRANSYT model, these values ‘combine’ with the network wide start and end displacement values – which are often set to 2 seconds and 3 seconds respectively. “Green start adjustment” and “Green end adjustment” values can be either negative or positive, and are specified as part of the TRAFFIC STREAM DATA. The phased-based “relative start displacement” or “relative end displacement” values, mentioned in Method 1, are also combined with the green adjustments if used, although use of both would be unusual and rare.
TRANSYT 15:
Bonus greens can be modelled by changing the phased-based “relative start displacement” or “relative end displacement” values in order to differentiate between ‘actual’ green time and ‘effective’ green time. Within the TRANSYT model, these values ‘combine’ with the network wide start and end displacement values – which are often set to 2 seconds and 3 seconds respectively. “Relative start displacement” and “relative end displacement” values can be either negative or positive, and are specified as part of the PHASE DATA.
Note: In situations where two traffic streams are controlled by the same phase, but require different displacement values, the phase should be copied, and set to control just the one traffic stream. The displacement values can then be changed as required on just that particular phase, leaving the other phase (whose actual green times will be the same as the other phase) with the original start/end displacement.
(Updated April 2025)