Half a croissant, on a plate, with a sign in front of it saying '50c'
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elevated stop lights

elevate the road near stop lights
  (+15, -5)(+15, -5)
(+15, -5)
  [vote for,

If we elevated the road near stop lights cars would naturally slow down as they approached the light and speed up after they passed through. The gravity assisted accelleration would waste less gas and there-by decrease pollution. It would also save on brake pads.
WhiteWiz, Mar 26 2004

(?) Elevated! http://bz.pair.com/fun/elevated.html
[35Kb image] A momentum in time. [bristolz, Oct 04 2004, last modified Oct 21 2004]


       Every stop is on a hill? Oh great, my wife already has trouble pulling out on a hill with a manual transmission. I can't afford no more repair bills! Besides, gets really slick around here in the winter. Wouldn't want to deal with any more hills than I have to already.
Nitehawk, Mar 26 2004

       Imagine being airborne across the entire intersection on a green, though.
bristolz, Mar 26 2004

       I like bris's idea better. The cross traffic would never have to stop because you would just jump over it.
AO, Mar 26 2004

       Until someone takes a left.
gootyam, Mar 26 2004

       Classic [Bristolz].
gnomethang, Mar 27 2004

       What a fantastic illustration!
FarmerJohn, Mar 27 2004


po, Mar 27 2004

       This is used on the London Underground - those Victorian engineers were gooood.
david_scothern, May 26 2004

       Umm, why is this in terraforming?
Knife Knut, Feb 13 2005

       Nice idea but expensive to implement. Lots of asphalt and manhole covers extensions to reach the new height, possibly even the overhead street lights and signs as they are probably set some standard distance from the road surface. The illustration is nice but shows a light in the middle, most lights (I think) are at the boundaries so the ramps would have to be pushed further back allowing cars to wander more easily onto sidewalks. Driving along a strip where the lights are timed and traffic is supposed to move smoothly will be interrupted by people who will slow at every ramp and those that get car sick. Also reduces visibility. Still I like the idea conceptually.
Widgit, Apr 17 2005

       The elevated part should be as long as a typical queue of cars, otherwise the ones at the rear would have to start off by driving uphill.
Ling, Apr 18 2005

       What happens when a pedestrian falls of the meter high sidewalks? (You will see me laughing!)   

DesertFox, Jun 18 2005

       Problem with this is at night time - cars' lamps are aimed at a slight downward angle. This means that coming at an intersection, you and your cohorts get each others' lights directly in your faces.   

       Sorry. [-]
shapu, Jan 31 2006

       Until you get there. We have a few of these in St. Louis - waiting at these stoplights, especially as the first car, is murder.
shapu, Feb 01 2006

       nice [+] I think they use this technique in some southern states...Hazzard county if I recall correctly.
redsimple, Feb 01 2006

       a. The illustration, althought beautiful, does not show decline toward the entrance to the intersection, so most of the point is lost. (I still second [xFarmerJ] on the fantastic Illustration). b. All thats needed is a "speed bump" hight upwards climb, except that it must with a much longer slope entering the intersection. If all intersections are built this way, you get an uneasy fall entering the intersection too fast, while at normal speeds you get two things: i. Easier ability to stop. ii. Easier ability to start (once over the head of the "hill"). [+]
pashute, May 16 2006

       Two buns for the illustration! [+][ ]   

       Dang, seems I can only give you one ...
nuclear hobo, Jun 26 2007

       While nicely slowing traffic on the "red" directions, it would also be busy impeding traffic that had a green light... [+] for the illustration though
FlyingToaster, Feb 25 2009

       Has potential... For complete energy recovery you would need a height of 14m for 60km/h, or 9.8m for 50km/h.
spidermother, Feb 25 2009

       It would work fine (and be a good idea) for light-traffic'd 4-way stopsigns, but not for heavy traffic and especially not for stop*lights*: that would just have people parked on a hill, waiting their turn, as well as making pedestrian traffic more wearying. If you did "the full Monty" on it with a 50ft high come-to-almost-a-complete-stop hill with enough of an apron on top that nobody has to stop on the hill, then you could have pedestrian tunnels, or in rural areas, a "green spot" underneath, but that would probably take up too much visual real-estate in the city.
FlyingToaster, Feb 27 2009


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