Intersect This 1
Indulge me on a philosophical detour. Everyone is busy living their own lives and scurrying around doing whatever it is they need to be doing. That’s just how life is. Sometimes two people will start at one place but have varying destinations. Or other times two people in different locations will start on a journey with the other’s origin as their own destination, with a serendipitous passing in between. And still other times two people will have a journey with no points in common at all. (How sad.) But possibly the most common is having two journeys cross paths at a single intersection. And what if the two travelers happen on this intersection at the same time; one must yield to the other to allow for both to continue their journey safely. If you really think about it this is the intrinsic nature of road intersections and traffic lights. And it’s slightly wondrous to realize that traffic lights allow for everyone’s daily movements to be interwoven together to form the continual dance we call commuting. (I swear that I’m really not stoned right now.) And it’s all governed by some lights, wiring, and some computers which use three colors to speak a ubiquitous language to usher travelers towards their destinations. Whoa, traffic lights … man.
I truly hate stupid intersections. These are the ones that are on a strict timer alternating back and forth to allow traffic to pass in different directions. Even if there is no one coming from a certain direction, a stupid intersection will stop actual traffic to give the green light to … nobody. (I want to shoot myself when I get caught in this.) Gradually intersections became smarter. Inductions loops were cut into the lanes near the approach of an intersection, and traffic controller system (the big green boxes sitting near every intersection) would process the data and control the intersection appropriately (i.g. changing the light only if there are cars waiting). These controllers were eventually taught to change their operating mode for different times of day to help minimize waiting times even more.
And for a time, things were good. Until you’re driving down a road and getting stopped by a red light at every intersection and it’s taking 233 hours to travel a mile. (This is another time when I want to shoot myself.) To help remedy this, traffic lights were synchronized (all the lights changing at the same time). But this would lead to inevitable stops inherent to the pattern of the synchronization. Then traffic lights became coordinated. (This is the bread and butter.) A master controller talks to all of the individual controllers to create a cascading wave of green lights. This would theoretically allow someone to zoom through town without hitting a single red light. Secondarily it would also give one’s ego a victory. (”Dude, I hit like 13 green lights in a row!”) And depending on the time of day these cascading greens would be coordinated in the prevailing direction of traffic (i.e. rush hour in the morning vs. evening). Not only does this save time and prevent traffic, but it also saves gas and limits pollution from energy wasted with start & stop driving.
Such coordination of traffic lights is not a trivial exercise. God bless all those eccentric MIT nerds and their algorithms for keeping our roads flowing. (If you’re at work and itching to waste some time, try out this online game to see if you can produce some cascading green lights of your own.)
As with any technological progress, “the people” clamor to know what’s coming next. Transportation engineers are continually pushing research and development efforts to enhance “intelligent transportation systems.” (Current implementation include electronic toll collection, traffic sensing technologies, and emergency vehicle notifications.) But the holy grail is the driverless car. Two of the biggest research initiatives towards this goal have been the EUREKA Prometheus Project and the DARPA Grand Challenge. The Prometheus Project is over, but DARPA continues to encourage the development of technology for an autonomous vehicle. Driverless cars would mean super smart computers on-board every car and in complete control all while in constant contact with every other car on the road. There might not be any stopping at intersections. Instead your car will “thread the needle” of crossing traffic at 100 m.p.h. Remember the two-second rule for following distance? That will become the 0.02 seconds following parameter. It’s quite simple really: the biggest problem with the current state of transportation is the human component. I’ve caught a glimpse of the future of personal mobility and you have nothing to do with it … except to be an uninvolved passenger. I can’t wait. ”Computer: drive me to the nearest toilet. I need to go pee.”







