But some angry motorists are saying that the agents are also increasing their quotas by taking advantage of what traffic officials acknowledge are contradictory or confusing signs.
"The Spaniards were still trying to make sense of confusing signs," he says in describing the Cortés expedition's slow grasping of ghastly Aztec practices.
He glanced at Saneter for confirmation and the old harper flapped his fingers in a confusing sign that the boy could not interpret.
But with more than 1.2 million street signs, New York City will not see a complete replacement of the old and confusing signs for several years.
As he struggles to find the truth beneath layers of confusing signs, his journey slowly draws him away from decadent blight into a healthier, earthier life.
The Delta captain said he had been misled by "confusing" signs marking the runway and taxiways, according to a spokesman for the airline, Richard Jones.
Alice comes across several confusing signs, many of which leading her back to the same place she was before.
She inquired: "Has anyone computed the cost to us all in work-hours of this confusing sign?"
This year's most amusing and confusing signs sent in by readers on their travels.
Contractions of the uterus can be a confusing sign.