I explained a few posts back on how it's done. What they do is utilize the left center turn lane. As the train approaches, the left signal automatically turns green to clear cars out of the turn lane so the trains can pass. So as the train moves down the street, the signals are choreographed to allow it to pass.
Obviously, one turn lane isn't wide enough so one lane of parking is sacrificed. Yes some people will holler about losing a dozen parking spots per block, but the benefit outweighs this. You never want to lose through lanes of traffic. You are right, it's not an option. But sacrificing parking is always an option. It doesn't have to be studied or require all that much community input. It's just eliminated. But removing lanes, or sharing lanes of traffic requires a lot more planning and clever signaling. The best usage is the center of the street since it receives the lightest traffic [[turning vehicles only) and the vehicles can directed when signaled. Plus you can place collapsable bollards in the median to discourage drivers from entering the center lane where no turning occurs, but permit emergency vehicles to enter the trackway if necessary.
This is more difficult to do in the right lane. If cars are attempting to park and merging in front of trains, the operator will be hitting the brakes alot. It's just like a bus.
Hopefully that answers the question.
In hindsight I had thought all along they were running center which is why I was a huge proponent of this line. But now I'm concerned and I think BRT would have been a better option since it accomplishes the same at a lower cost. At least it would had been a bit more flexible for expanding capacity or modifying travel-way in the future.
Oh well, I'm still going to ride it anyway. At least for the basic purpose hudkina described, it will get me from New Center to downtown when I'm visiting in town.
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