F-Line to Dudley
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U.S. routes have never had to be four lanes. Interstate highways are the only route designations with very rigid guidelines for lane widths, shoulder widths, etc.
Eliminating a lane each way along Brighton Ave for a light rail right-of-way would certainly be doable if the political will and community support were there. It would do wonders for the Brighton Ave corridor -- perhaps even spurring apartments/condos built atop current shops?
A lot of Allston and Brighton has the ability to increase density very easily through infill. Make the B (and future A) run reliably and you'd instantly increase desirability here.
You wouldn't have to eliminate the full 2 lanes. I don't see why a wide travel lane, a narrower bus/bike lane, and parking taken at intersections for a full complement of turn lanes wouldn't have worked with tracks staying on the left side of the yellow stripe. The flow would actually work better that way as parallel parkers would turn in/out on the narrower diamond-stiped lane without fucking up thru traffic, and double-parked delivery trucks wouldn't block a thru lane either like they do CONSTANTLY now. Nothing whatsoever would screw with the trolleys because you can't block the yellow paint for any reason.
There's no written rule that a thoroughfare has to have 4 travel lanes. That doesn't work in the middle of the city anyway with the number of intersections, curb cuts, parallel parkers, double-parkers, pedestrians, and transit vehicles zipping in and out. Outside of parkways and streets where parking is banned I'd argue it frequently does more harm than good because 4 lanes encourages excessive speed on an opening then sudden braking...sometimes every several dozen feet. How does totally hosed flow = road capacity? It doesn't. Concentrate on the flow and traffic-calming it into the natural flow fitting its layout, and honestly it'll work better.
Brighton Ave. is a prime offender here. Everything flowing into it flows better than Brighton Ave. itself. Ironically, it's the Union Sq.-Oak Sq. part that does have 2 lanes--2 single over-wide lanes with turning radii--that flows better than Brighton Ave. And volumes are plenty high from Union to St. Elizabeth's. Nothing encourages choppy flow like cramming 2 travel lanes, a "high-speed" median, and zero shoulder space before parallel parking and curb cuts on a city street with 8 bazillion parking spaces, curb cuts, and intersections. See Mass. Ave. from Cambridge Common to Alewife Brook Pkwy. How come the 2-lane + bike lane from Central to Mt. Auburn outperforms the shit over the 4-lane + median in North Cambridge? Or how shrinking the road from 4 to 3 lanes and adding beefy bike/bus diamond stripes from Central to the Charles made that formerly hellish segment not so hellish? Or Comm. Ave...better to BU Bridge since it shrunk from 6 to 4 lanes with the diamond stripe, no? Still horrific from BU Bridge to Packards as a six-pack unseparated from parking and loading zones, yes?
This is very much a "but this is how we've always done it" security blanket not grounded half the time in reality. There's countless examples of this of varying severity in town, but Spite Median'ed Brighton Ave. is a pretty bad one.