Quote:
Originally Posted by Djeffery
That last bit isn't the real problem because it would be the same as if there was a single straight through lane and a left turn lane. Westbound still couldn't see if there was something coming straight through, which is what many intersections are like now. The problem is if there is a westbound car making a left, and not realizing the car behind the guy making a left from the eastbound inside lane isn't making a left but going straight through. You go to make your left, westbound to southbound, and a car is making a left opposite you and all of a sudden a car pops out from behind that guy going straight through. I hate these dual use left turn lanes, its not going to really reduce congestion because there will always be somebody turning left there. Then the people behind trying to go straight will be making last second lane changes, slowing down the flow or adding to collision risk.
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I agree with you mostly, but the difference is that at those regular intersections (including how the intersection is currently set up)... you have the ability to maneuver your car to easily see oncoming traffic around the opposing left turning car (I think it's called the s-turn??). ... see image below
But if the intersection were to be redesigned for a shared left/straight lane, you would not be able to do that maneuver safely because, as you mentioned, the car behind the opposing left turn car might be going straight, and you would be in their way if you're stuck in the middle of the intersection...and that could cause all sorts of conflict issues... I don't know if I explained my thinking right lol.....
But all in all, I think this redesign would create a completely unnecessary risk and to your point, would not significantly improve congestion....