Sharraxaadda

Section 1209.2 states,

A person may secure a bicycle to a stanchion [parking meter or other pole] by means of a lock or similar device as long as securing the bicycle does not obstruct or unduly impede traffic or pedestrian movement and as long as securing bicycles has not been forbidden by any notice posted by the Director.

However, according to 1209.3 you cannot lock to the following:

a. Fire hydrants;

b. Police and fire call boxes;

c. Electric traffic signal poles;

d. Stanchions or poles located within bus zones or stands;

e. Stanchions or poles located within twenty-five feet (25 ft.) of an intersection;

f. Trees under ten inches (10 in.) in diameter.