Traffic engineers have changed the timing on a light near Murray Circle, a tweak they say should ease gridlock for car drivers. The state recently painted lanes at JP's largest rotary as part of an overhaul of the whole Arborway. The change has won wide acclaim among bicyclists but raised blood pressure among drivers. The gridlock has been worst along Centre Street from the Faulkner Hospital to Murray Circle. In a press release Friday, the Department of Conservation and Recreation said they've received "some complaints about congestion on the Arborway and Centre Street northbound in the afternoon rush hour."