[Description] The minimum duration of the Walk indication for pedestrians. The phase cannot gap out or be forced off during this interval. [Setting] 
Pedestrian Walk
M i n i m u m G r e e n
V a r i a b l e I n i t i a l G r e e n
P e d e s t r i a n W a l k
P e d e s t r i a n C l e a r a n c e
G r e e n E x t e n s i o n
M a x i m u m G r e e n
Y e l l o w C l e a r a n c e
R e d C l e a r a n c e