It is a major roadway to the Massachusetts Turnpike.
"We think they throw them right off the roadway to send a message," Sheriff Arpaio said.
This hardened the surface and caused the roadway to sink, leaving troughs that retained moisture and promoted vegetation.
Before they could get there, however, angry protesters gathered along a roadway to block their path, holding signs ("Go home!") and chanting ("U.S.A.! U.S.A.!").
In 1948 the city decided to expand the bridge's capacity for automobile traffic by removing the trolley and el tracks and widening the roadway to three lanes.
Preservationists have been alarmed by preliminary discussions among state transportation officials about retooling the unused rail cut -- completed in 1861 -- as a roadway to ease traffic congestion.
They drove to a small wooded area in Pelham Bay, parked and walked the dogs across the roadway to the woods.
The devices will allow drivers who use the New Jersey roadway to have their passes read from above, instead of from ground level.
In March, more than two dozen rods used to anchor the roadway to important earthquake safety structures cracked after they were tightened.
Enter the park at Prospect Park West and Fifth Street, walk through the Litchfield Villa parking lot and cross the roadway to the Picnic House.
The three tollbooths are the last of 11 on the eastbound roadway to be removed since the work began last year.
