I was worried they were only going to let on humans that are carryon size.

Would love to see someone hack the firmware and get it to work on a playstation or wii. That would be a wonderful hack. =)

Many people have written that this is a social problem not a technical one. Here's why they are wrong.

I have been to Egypt on many trips and have seen firsthand the problems described above. In egypt, there is rampant corruption in the government. That trickles down to all agencies. The people who pay taxes do not get anything in return. Nobody obeys traffic laws there. People frequently cram 6 cars into the equivalent of 3 lanes of traffic. People believe the lines are for decoration. In the areas where there are traffic lights, nobody obeys them. The only person people obey is soldier with the machine gun directing traffic. They are groomed with the understanding that as long as they don't piss him off they get away with everything else.

What people are asking him is to essentially revolutionize the government and make it work. The people only understand money. If you have money, you get what you want. If you don't, you end up with the above situation.

As an example, a number of years ago I witness a car accident on a busy street which backed up traffic for miles. It was between a guy on a motorcycle and a guy in a car. The two drivers started fighting in the middle of the street and a crowd of people developed. The soldier didn't care about the people involved or the damage to the vehicles. He pointed his gun at the crowd and told them to move the cars or else. The crowd moved the vehicles on the sidewalk and they to got on the sidewalk. The fight continued but traffic started moving again.

For your technical solution, there are going to be lots of caveats. In Egypt, for example people will steal just about anything. I have seen people steal electricity, phone lines, natural gas, side-view mirrors on cars just about anything. If you create this system, theft will be a big issue. If you can guarantee that know one will steal your system that is your first hurdle. Soldiers in egypt are paid so little that they may not care for your system - especially if the guy who broke the law will pay them a bribe directly on the spot versus paying a fine to a higher up agency where he will never see his cut.

If you can start with the block that you live on and mount webcams (*note -- In egypt, this will run you afoul of the government and the soldiers regardless of your intent!) on your building to prevent theft then you can log all the cars coming and going. This would make it easier to identify who the parties in the accidents are in case someone flees.

Speedingwise, I have seen stories of how people take apart optical mice and use them as sensors. There is probably a cheap way to rig this to give you timings of start/stop points. You could then time how long it takes a vehicle to cross two of these sensors to determine rate of travel. If you take snapshots of the clock time at both locations, you could do a look up against the snapshots from your webcam. Or you could use this to determine when to take snapshots on the webcam.

This is basically how the toll road cameras work here in the states. Even if the driver gets away, you can at least identify the driver in the future.

I just had a look at their study and found several flaws. I own two priuses by the way a 2002 and a 2010.

First of all, they are comparing a toyota matrix with a toyota prius. These two vehicles are not remotely equivalent. The only thing they have in common is the fact that they are both built on the same platform. This same platform also encludes the echo and the corolla. The prius also has a lot more combinations of features and models. They didn't identify whether it was a Prius 1 package 1 or a Prius 5 package 4. They arbitrarily look one at $27K and compared it to a $21K matrix. They should have taken a Prius 1 Model 1 ($21,000) and compared that to a Matrix or specified the features so that a direct comparison could be made.

Second, they assumed 20,000 KM which is roughly 12,400 miles a year in driving. Maybe in Canada they can get away with driving that many miles but in California, I drive at least 15,000 miles a year. I see at least a 20 mpg discrepance between the two cars. 3000 miles / 20 mpg X $4.68 per gallon ($1.17 per litre assumption in study) = $702.00 a year savings in fuel. I have had my prius for 8 years and 120,000 miles on my 2002 which translates to at least $5600 saved in fuel over the matrix.

Third, they haven't taken maintenace into account. Hybrids suffer a lot less wear and tear on the engine than normal vehicles. Services that you get at 30,000 miles transmission filter, brake fluid flush, throttle and fuel injection flush, etc don't need to be done until 90,000 miles on a prius. That was my experience and I took the car to the dealer for everything.

I know they included 5 year estimates, but even if you looked at 5 year estimate using an apples to apples comparison here in the United States you would see they hybrid is much more cost effective. The devil is in the details.