A proposed Purple Line route won’t do too much damage to traffic flow at one busy downtown intersection, reps for the state transit administration claim.

The mass-transit project could chug through Wayne Avenue at Fenton Street in downtown Silver Spring. That’s if a Wayne Avenue route is chosen to link Long Branch with the future Silver Spring transit center, Joe Romanowski and Harriet Levine, consultants with the transit administration, explained at a public meeting Monday night.

“We can have a lot of movement at that intersection,” Levine told 90 people kicking it inside the Round House Theatre.

Rolling westbound on the proposed route, the Purple Line would cruise with car traffic from Sligo Creek Parkway to Fenton Street, the consultants said. The route then would cross Fenton diagonally into a station near Bonifant Street, next to Silver Spring’s future library.

One possible Purple Line route.

Orchestrated traffic signals and a Purple Line-only left-turn lane on Wayne would keep things in check, they added.

“Cars can’t turn [left from Wayne onto Fenton] when there’s a Purple Line there,” Levine said. “But when the Purple Line vehicle makes its move [toward the station], westbound cars will still be able to move.”

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Video: Animation showing how things will roll on Wayne Avenue at Fenton Street if the Purple Line goes through that intersection. Notice the northbound car on Fenton that blows the red light, then the westbound car on Wayne that nearly gets clipped while turning left onto Fenton. Presented by the Maryland Transit Administration; bootlegged by R. Pace/SSP.

What will it cost drivers waiting for the lights to turn green? An additional 15 seconds, based on the state’s current traffic model.

That model takes pedestrian activity into account (whether that includes jaywalking isn’t clear). But it doesn’t consider auto traffic waiting to enter the Wayne Avenue garage, which meeting attendees blamed for snarling traffic at the intersection.

It also doesn’t consider traffic tearing into and out of the Whole Foods Market parking lot, which has an entrance on Wayne between Fenton and Cedar Street. The westbound Purple Line’s left-turn lane could block that entrance entirely, consultant Romanowski said.

The transit administration and The Peterson Cos, which manages the parking lot, are working to fix that problem, both parties have said.

Photo (lead): Transit engineer and consultant Joe Romanowski talks purple at the Round House Theatre. Credit: R. Pace/SSP.

Map courtesy of the Maryland Transit Administration.

Edited Apr 29, 2008, at 3:20 p.m.