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Old 27th October 2014, 22:48   #1
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Default GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

Hello fellow BHPians,

I came across this on twitter today evening. Please check it out at www.differentearth.com


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Greenlight is an amazing idea to solve the problems of traffic jams. Most traffic jams occur due to congestion on crossings. Greenlight comes up with an innovative design which helps traffic move very efficiently on traffic signals. Greenlight can increase people’s probability of finding a green light on a traffic signal and pass it without any wait by more than 100%. And even if people encounter a red light and have to wait, their waiting time will be reduced by as much as 66%. - See more at: http://differentearth.com/


Implementation of this is difficult, but still is a brilliant idea.

Warm Regards

Last edited by D4D : 27th October 2014 at 22:57.
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Old 27th October 2014, 23:16   #2
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

Very interesting. This has been implemented in parts (such as no right turn) but never coordinated across long stretches yet.

In fact, even if some basic rules such as bus bays, proper parking etc is done, that itself will help a great deal. We need those basic things in place before we get to these more advanced mechanisms. Not that I am pessimistic but yes, someone has to keep trying new ideas and something that will work for India also will come by!
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Old 27th October 2014, 23:37   #3
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

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Implementation of this is difficult, but still is a brilliant idea.
It is a nice idea. It was discussed in WP: The case for almost never turning left while driving

Actually UPS drivers avoid left turns (LHD) where ever possible. Since right lane turn right is strictly enforced, travel time is reduced if you take series of free right turns.
Source: When in doubt: UPS avoids left turns
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Old 27th October 2014, 23:45   #4
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

Really bright idea. Explains the case for why DTP has constructed U turns on some of the major roads in the capital. But I think they forgot the bit about disallowing right-turning traffic!
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Old 28th October 2014, 00:04   #5
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

Not a ground-breaking idea. Look up hook turns - a common feature in Melbourne. http://en.wikipedia.org/wiki/Hook_turn

Certainly needs excellent lane discipline to implement it. Can't say that exists in this country.

Last edited by SS-Traveller : 28th October 2014 at 00:06.
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Old 28th October 2014, 06:17   #6
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

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Not a ground-breaking idea. Look up hook turns - a common feature in Melbourne. http://en.wikipedia.org/wiki/Hook_turn

Certainly needs excellent lane discipline to implement it. Can't say that exists in this country.
+1

Needs sufficient lanes too in the first place, in many parts of our country. I see many signals with just about 1 proper lane marked and people squeeze in to make 2 lanes within that.

Green light is a nice idea. Could be implemented in areas which already have proper roads with sufficient lanes in place. Rest of the roads need to be developed before implementing it, especially for the left turn + U turn.
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Old 28th October 2014, 07:38   #7
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

For India, a far simpler approach of crossing the line only if they can cross the intersection before the light turns red can make a big difference. People think that it is legit to cross the line upto the point where light turns red often causes many to wait in the middle of the intersection, thus blocking drivers of the next road from passing when their turn comes up.
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Old 28th October 2014, 08:29   #8
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

May not work or will require strict impose of rules for such change. We have so many idiots on road who will block the C-turn.
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Old 28th October 2014, 08:51   #9
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

Certain countries have implemented so called 'green zones'. On a road with a series of junctions/traffic light you will hit all the lights green as you long as you stick to a specific speed. On the more fancy ones, the speed you need to travel is dynamically calculated and displayed on digital traffic signs.

Works pretty well, but as pointed out, you do need lane discipline, because traffic turning right and or left, need to stick to their dedicated lanes, so the main flow of traffic can continue unobstructed. I have yet to see any lane discipline in India.

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Old 28th October 2014, 09:16   #10
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

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For India, a far simpler approach of crossing the line only if they can cross the intersection before the light turns red can make a big difference.
I second this totally! I have seen that in most places, the lane that has green light, cannot achieve the desired throughput since the previous lane's traffic is still blocking the intersection. This leads to long waiting times at the lights for all lanes, and leads to queues extending, in some cases, a few kilometers.
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Old 28th October 2014, 12:09   #11
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

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Originally Posted by condor View Post
For India, a far simpler approach of crossing the line only if they can cross the intersection before the light turns red can make a big difference. People think that it is legit to cross the line upto the point where light turns red often causes many to wait in the middle of the intersection, thus blocking drivers of the next road from passing when their turn comes up.
Agree but for that the timings of traffic signal need to be properly calibrated.
In Bangalore many signals have Amber light and pedestrian crossing signals for just a split second giving no time to react.
Also traffic-police men somehow feel they should turn off the signal and manually manage traffic which solves immediate long queue but after initial 5 minutes worsens the situation because a fare time-share based system is replaced by individuals discretion.
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Old 28th October 2014, 13:11   #12
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

I recall this was implemented in Philadelphia in 2001-02 from Penn Station to Center City. It was a good success because of people yielding when they merged into or out of the C.
It's precisely for this reason that it probably won't be a success in India, because, the concept of yielding to someone is unknown, and even if known to a few, not followed.
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Old 28th October 2014, 13:23   #13
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

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Originally Posted by joybhowmik View Post
because, the concept of yielding to someone is unknown, and even if known to a few, not followed.
Exactly my thoughts. The concept as an idea is good, but implementing it in a country like ours is going to be a difficult task. Before they get into this, people should be made aware, fined heavily about lane discipline, then this can make things a little better.
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Old 28th October 2014, 13:40   #14
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

Its a nice idea, in theory. But it won't work in India, because:
1. Everyone who needs to turn right will try to squeeze on to the first available C-turn. On intersections with large amount of traffic towards right, this will clog up the intersection itself, as "don't block the intersection" does not apply in India.
2. There will be people who will take a right turn at the intersection anyway, if there is only moderate traffic on the other side of the road.
3. Numerous other practices seen only on our roads (driving on the wrong side for an example)
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Old 28th October 2014, 13:50   #15
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Default re: GreenLight: Reduce traffic jams by eliminating 'right turns' at signals

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Originally Posted by amitk26 View Post
Also traffic-police men somehow feel they should turn off the signal and manually manage traffic which solves immediate long queue but after initial 5 minutes worsens the situation because a fare time-share based system is replaced by individuals discretion.
This, unfortunately, is such a big issue in Delhi too. As and when the traffic policemen try to regulate traffic, they end up creating a mess that takes hours to clear. And, most times when they decide to turn-off the lights, it would be in the middle of peak traffic times of morning and evening rush.
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