The scheme would perform worse in a scenario in which travel by motor vehicle was lower as a result of existing policies and emerging plans.
Byddai'r cynllun yn perfformio'n waeth mewn senario lle byddai lefelau teithio mewn cerbydau modur yn is o ganlyniad i bolisïau presennol a chynlluniau sy'n cael eu datblygu.