No vehicle may park in any Tri-Met Bus Zone, except:
A. A Tri-Met Bus or a contract or franchise bus of Tri-Met while passenger loading/unloading for a period not to exceed 2 minutes;
B. When allowed by the terms of a contract or franchise with the City of Portland for a period not to exceed 2 minutes; or
C. A taxicab for a period not to exceed 15 minutes. Taxicabs may not use Tri-Met bus zones during the hours of 7 a.m. to 9 a.m. and 4 p.m. to 6 p.m.
D. The buses described in subsections A and B may park in a designated Tri-Met bus lay over zone for a period not to exceed 30 minutes.