US1.
2.41
7
Perform fixed cost transit assignment with new congestion costs to obtain 
and 
.
5.11/5.31
8
Compute stopping criterion GAP.
2.41
9
Perform line search for obtaining optimal step length 
. This is implemented using the secant method to annul (15).
2.41
10
Update transit volumes 
.
2.41
11
Update total travel time 
.
3.21
12
Test normalized gap stopping criterion. If GAP 
then STOP, else continue with step 5.
2.41
[1]For technical reasons, this step is implemented in the macro not in module 2.41, but using low level data manipulations in module 1.11.
In its current form, the CONGTRAS macro only considers crowding within the transit vehicles. But of course, as can be seen from the model formulation in the previous section, it is also possible to include congestion discomfort outside the transit vehicles, such as crowding on the platforms and on the pedestrian walk link - as long as the discomfort function is symmetric (i.e. the same travelers that are causing the congestion are also suffering the effects of it).
Conclusions
W
