MTA line to test device that can flip traffic light

May 11, 1993|By Peter Jensen | Peter Jensen,Staff Writer

Never having to stop at a traffic light -- the fantasy of many a harried commuter -- is about to come true for some Anne Arundel County bus passengers.

Nine Mass Transit Administration buses have been outfitted with a device that acts like a TV remote control to turn traffic lights along Ritchie Highway to their favor, even letting buses go through red lights.

Beginning June 1, the MTA's No. 210 Express bus from Annapolis should never have to stop at a traffic signal until it reaches Baltimore.

By bypassing traffic signals, a bus can shave 10 minutes off the present 52-minute trip, MTA officials say.

A total of 13 traffic lights on Ritchie Highway from Annapolis to Md. 100 and one on Baltimore-Annapolis Boulevard will be involved in the experiment, run jointly by the MTA and the State Highway Administration.

"Time is important to all of us," says James F. Buckley, the MTA's assistant general manager for operations. "That 10 minutes could mean an extra slice of toast or getting to work early enough to screen your phone calls."

State officials are hoping the device will provide a boost to bus patronage.

The test system is called Opticom. Manufactured by the 3M Co. of Minnesota, it relies on a pulsing, invisible infrared light signal transmitted from the bus and picked up by a receiver mounted on a traffic light pole.

First made available in 1968, Opticom has been used in towns and cities across the country to give priority to emergency vehicles at traffic intersections.

Only in recent years has its use been expanded to public transit. Opticom gives a bus the ability to make green signals stay green long enough for the bus to cross, says William J. Lochten, a 3M marketing representative.

But 3M officials say Maryland's application will be unique.

In addition to extending green lights up to one minute longer, the device will let buses that confront a red light along Ritchie Highway to pass through the intersection exclusively with all other traffic stopped.

That ability is called a "queue jump" and transit experts say Maryland's use of it is a first nationwide.

The queue jump will be available at five of the 14 intersections involved in the test.Traffic will be stopped in all directions and the bus will be signaled to cross on the shoulder or right-turn lane.

Newly installed signals similar to those used by light rail trains on Howard Street will tell a bus driver when to go through the intersection.

"The red signal in all directions will be frozen up to 14 seconds to give the bus a head start," says Thomas Hicks, director of the SHA Office of Traffic and Safety.

The No. 210 currently handles about 150 round-trip passengers a day with five bus trips in the morning and five in the evening, an average of 30 people in each bus.

The experiment is bound to be controversial. By giving buses priority at intersections, traffic engineers are delaying travel for everyone else, particularly those who already face long waits from side streets onto Ritchie Highway.

Those delays could leave motorists waiting at traffic lights for an extra 30 seconds to a minute under the worst circumstances, Mr. Hicks says.

The wait will "probably be much less than that" for most travelers, he says.

There have also been questions raised about safety. How will people react to the new system?

For instance, will casual drivers stopped at red lights notice that the bus next to them is moving forward and take that as a cue to proceed?

"We're concerned about that. People don't always drive consciously," Mr. Hicks says. "Maybe we'll have to put up a sign, 'Move on green only,' or something like that."

Could the average driver trip the Opticom intersections with his or her own strobe light?

Officials with 3M say that's never happened and point to its successful application in 30,000 intersections in 850 towns and cities.

Mr. Hicks says the SHA engineers hope to answer these and other questions by watching the system work on the 10-mile strip of Ritchie Highway for the next two months.

The experiment will cost $155,000 and has been financed wholly by the U.S. Department of Transportation.

State officials point out that it's far less than the cost to add a bus lane to Ritchie Highway.

"We're one of the worst regions in the country for air pollution," says the MTA's Mr. Buckley.

"I think it's fair to give priority to a 47-seat bus over a car with one person inside."

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