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There have been 21 traffic fatalities so far this year, one more than at this time last year.

The automated enforcement program has generated more than $142 million since 1999. The city’s 49 red-light cameras have generated more than $36 million, including $5.2 million last year.

The speed-cameras generated $3 million in April, the most recent month of statistics available from the Metropolitan Police Department. March and April were the first times the monthly collected revenue totaled more than $3 million.

George Porter, 51, a taxi driver and lifelong D.C. resident, said he hasn’t seen many cameras in Northwest. However, he said he’s noticed quite a few on heavily traveled roads in Northeast and Southeast, including Benning Avenue Northeast — a freewaylike thoroughfare which is not located in a residential area but has a 30 mph speed limit.

“That one just seems excessive to me,” Mr. Porter said. “There’s no way you’re going to hurt a pedestrian there.”

James Cole, 46, who was born and raised in the District, said he thinks commuter routes are the program’s primary target, but the lack of cameras outside of the eastern half of the city lends credence to the claims of racial disparity.

“There aren’t a lot of blacks that live west of Rock Creek Park,” he said. “If there’s not a lot of cameras across from there, then certainly the argument can be made that they’re [racially] disproportionate.”