Slashdot Mirror
Road Marker Marks You
If you could make a reflective road marker (a "road stud", in the jargon) that contained a small solar cell and battery, you would be able to: A) power a LED at night to provide lit lanes, not just reflection; B) monitor for fog or water on the road surface; C) monitor the temperature to detect ice; D) use infrared ranging and embedded cameras to detect and report the license number of anyone speeding on the road; E) All of the above. If the company can make them cheap enough, they'll be everywhere in a few years.
Here.
this
In a Road That's All Eyes, the Driver Finds an Ally
By IAN AUSTEN
ABOUT 12 years ago, Martin Dicks was trapped in dense fog during a harrowing four-hour commute to his job as a firefighter in central London.
"Virtually all I could see on the road was a cat's-eye reflector every now and then," Mr. Dicks said, recalling his trip down one of Britain's major highways. "I figured that if I could make the cat's-eyes more visible, I could probably save more lives than I could in the fire service."
A back injury forced Mr. Dicks out of the fire department shortly afterward, giving him the time to pursue that goal. His training as an electrical engineer provided the necessary skills.
Now, after perfecting illuminated markers that are embedded in the road surface to guide motorists through bad weather or warn of dangerous conditions, Mr. Dicks's company, Astucia Traffic Management Systems, is going a step further. Its latest creation is an embedded stud equipped with a camera that catches speeders, monitors traffic for criminals or stolen cars and even checks for bald tires on the fly.
"Nobody knows it's a camera or a speed trap," Mr. Dicks said of his latest creation.
Mr. Dicks's original idea was quite simple in concept. He wanted to create an illuminated road marker containing its own power source, a solar cell. At night or in bad weather, light from approaching vehicles would generate enough power to light up the marker, which consisted of light-emitting diodes. An illuminated marker would be more visible than a plain reflector, and the idea was that a car passing over the markers would cause them to stay illuminated long enough so that they would provide a warning trail of lights for any vehicles close behind.
The trouble, at first, was the technology available in the early 1990's. Photovoltaic cells were not as efficient as they are today. And at the time, Mr. Dicks recalled, "the concept of a white L.E.D. was nowhere."
Working mostly with family members at first, Mr. Dicks produced a prototype marker within two years. He dodged the white L.E.D. problem by combining the glow from red, green and blue arrays. The group not only overcame the limitations of solar cells, but also managed to engineer markers that turned red to warn when the gap between two cars was dangerously small.
Mr. Dicks said the technology both impressed and alarmed British government highway officials.
"They were frightened about everyone using the product on roads from one end of the country to the other," he said. "They thought it would make their budgets disappear."
The first markers cost roughly twice the price of conventional embedded road studs. As a result, their use was restricted at first to especially fog-prone or dangerous sections of roads as well as crosswalks, including some in the United States.
Mr. Dicks was not the only person with a desire to illuminate to road markers. After a friend struck and killed a pedestrian in 1991 at a crosswalk in Santa Rosa, Calif., Michael Harrison developed a system that uses flashing L.E.D.'s in the road surface to make crosswalks more visible. The company he founded in 1994, LightGuard Systems, now has about 700 installations in the United States.
A study of 100 illuminated crosswalks by Katz, Okitsu & Associates, a traffic engineering firm based in Southern California, estimates that adding the blinking L.E.D.'s to crosswalks can reduce pedestrian accidents by 80 percent.
The original Astucia markers were glued onto the road surface. That left them vulnerable to snowplow blades and to constant pounding from car and truck tires.
Mr. Dicks wanted to put the markers into holes drilled into the road surface. The key, he said, was finding self-healing resins for the top lenses that would be flush with the surface and subjected to much wear and tear.
"It's like running your fingernail on a rubber sheet," he said of the plastics' behavior. "The mark it leaves goes away."
A
Blah, Blah, Blah - RTFA.
"The original Astucia markers were glued onto the road surface. That left them vulnerable to snowplow blades and to constant pounding from car and truck tires.
Mr. Dicks wanted to put the markers into holes drilled into the road surface. The key, he said, was finding self-healing resins for the top lenses that would be flush with the surface and subjected to much wear and tear."
sheesh, I'd accept a temporary increase in my vehicle registration for a couple of years to see these on the farm roads here in Texas.
You haven't lived until you've torn a chunk of the drivers seat out with your ass because of an unexpected turn.
For those of you who haven't had the pleasure of driving on a farm road in Texas, here's a brief description.
1.5 lanes wide
No shoulder
Painted lines optional
Random livestock
"Lame" - Galaxar
Actually, gram is mass, newton is mass * acceleration which is equivalent to weight when referring to the acceleration due to gravity...
I print, therefore I am.
What kind of dumbass modded this up? A gram measures mass; weight is the force exerted on an object due to gravity.
Actually, we only use GMT in the winter. At the moment we're on BST which is one hour ahead.
It's my understanding that the studs are embedded in the roadway and cannot be hit. As this page backs up, there is only a 4mm spot that is raised above the pavement, which allows snow removal to occur over it.
If a snowplow isn't taking them out, neither will you.
From my years of driving in 2M+ person cities, I've had time to observe what slows down traffic flow.
Three things: braking (slow spots), inattention/under-limit driving, and fear.
- Slow Spots
What slows down traffic flow most is people braking when they don't need to, or braking more than they need to. The problem is that in congested traffic, once one car slows in one lane, a wedge of cars behind him slows, and behind them everyone slows.
Then when that one driver speeds up (and it takes much longer to speed up than slow down), the next cars THEN speed up. They don't speed up exactly when the lead driver does because it takes them time to see the change. This carries on behind them.
This creates a slow spot on the freeway. Once a slow spot is created, it only goes away once a gap backwards in traffic is large enough to allow the slowed vehicles to speed up to normal speed before the gap is completely closed by the approaching traffic.
- Under-limit Driving
This is obvious. Left or center lane driver drops below speed limit, cars behind have to slow (often they use their brake instead of coasting down), and you're in the situation above (slow spot).
- Fear
Car needs in another lane. Most drivers, if there is room ahead of the vehicle beside them, will still brake and try to fall in behind the neighboring vehicle. The following vehicles in that lane may not be friendly, and may not allow that. So fearful driver brakes even more, hoping to eventually get over. I've even seen some fools come to a complete stop in the middle of the freeway so they can hopefully work across 3 lanes to exit. They should have either sped up and pulled in front, or if that took too long, gradually worked their way over, missed their exit, and looped back.
These things don't mean you should never brake, or that you should always drive aggressively, but some middle ground approach would surely improve things. The time cost for a full traffic jam is enormous. 5 minutes times 200,000 vehicles is 11 days of time. In a perverse way that's a really significant amount of power that one driver can exercise. Create a good traffic jam and you've just wasted 11 days of your town's time.
.sigs are for post^Hers.