Some intersections have a sensor under the asphalt to detect a vehicle and sequence a light transition, and its not a new technology
There's also an even more perverse failure mode: we often end up waiting for 2.5 minutes with no other cars anywhere in sight, then when a lone car is randomly approaching the light that's been green for no cars (going its way) for 2.5 minutes, that one car gets stopped and waits as we finally get our turn arrow after 3 minutes. If the light was the least bit "smart", it would have changed for us right when we pulled up and no other cars were in sight. The turn arrow is only 10 seconds, so we would have been long gone and the intersection back to green by the time that other car was approaching - no car would have needed to wait and everyone would have been better served.
But they aren't marked. So what sometimes happens is I cruise up on a bike, in the middle of the road because none of those have bike lanes.. and the bike, naturally, never triggers the lights. Neither does the car behind me.
It is the only way the system will realize you are waiting.
Traffic engineers probably have a term for this kind of bi-polar intersection. A solution would be some kind of "conditional left arrow" but there's no such thing (at least here in the U.S.) If there's a dedicated green arrow for left turn, then there's a modal left-turn red arrow along with it. It should be possible to improve all scenarios by standardizing something like a flashing yellow arrow to mean "okay to cross if no oncoming traffic" since this already works as the default behavior at intersections with no lights or lights with no left turn arrows.
That's already a thing, unless I'm misunderstanding you. We've had flashing yellow left turn arrows for years. I'm in the PNW, but I've seen it in other places in the US, we're definitely not unique.
I suspect choosing not to flash them at night is some combination of people not really familiar with that system getting potentially confused and (these are somewhat complex intersections) others just getting careless rather than carefully checking, at night, all the directions that traffic could be coming from.
A big roundabout I use semi-regularly does indeed handle 4 busy roads coming together well at night even if it’s a nightmare at rush hour.
The climate activists should be focused on solving that problem.
No AI required, just basic thoughtfulness and requirements gathering.
Contrast it with the flow achieved when there's a traffic cop managing an intersection. It's an enormous improvement.
Doing 75-80 on flat land, or 65-70 over the Sierra Nevadas, it gets 24 mpg. With city traffic in other cities it gets 18 mpg.
The reason it is so bad here is that the environmental activists passed traffic quiescence laws that try to discourage people to drive by making the roads worse.
Of course, they don’t make obvious fixes to improve public transit, and the bike lane “improvements” they put in are mostly textbook “how to kill bicyclists” designs that European countries phased out decades ago.
Here are two classic favorites: concrete barriers that are too close to the curb to allow street sweeping, and adding bike lanes between parallel parking spots and the sidewalks.
They must have realized people started re-routing their trips to avoid stoplights unless they were making right turns, since they’ve also started erecting barriers or adding red arrows to make it impossible to make right turns on red.
Anyway, this wastes time, but it also costs us at least $100 a month on gasoline. Our primary car is an EV.
Anyway, around here, even a small investment in reducing idling (or just cutting funding for traffic quiescence projects) would be equivalent to increasing vehicle fuel economy by something like 20-80%.
sure, but I'd rather just lobby against cars at that point. Especially in a place like the Bay Area that should be mostly served by public transit and dense housing. Lobbying to micromanage idling just feels like a waste of effort for such a negligible benefit.
Shouldn't they have been pro-nuclear if they actually cared about the planet? But it seems to me they really care more about pushing their own ideology instead.
Do you know that "they" aren't? Who is "they" even? None of this makes any sense. This is arguing against a group that is imagined to be homogeneous when that's clearly not the case.
Annoying because there are hardly any stoplights here. So it works by killing the engine for one second at the first roundabout you roll up to before you remember to hit the button that disables it for the rest of the trip.
I always thought they would work great in the states.