As for the rubber and oil, how often do cars leave rubber trails? And how often do they leak oil?
Add to that glass which isn't as permiable as asphalt and normal rain may take care of the problem. But that's something the prototype will help answer.
Car tires constantly shed rubber. It's what happends when a thing like friction occurs. That is why tires wear out. Or did you think that tires wear due to evaporation?
Also, no matter how well engineered a car is, it will inevitably have a little less oil when you take it to have the oil changed than it did when the oil was topped off last time. Where do you think this oil went? I have not even mentioned soot from the exhaust pipe.
In addition, you have natural dirt, such as mud and dust. How long do you think that the road will stay clean?
So you think there are cars covering all the roads all the time?
And the glass is not weak or thin. They've been through 2 rounds of testing and have exceeded all requirements concerning weight and traction.
Plus, it's their hope to have this on sidewalks, driveways, and as sport courts in parks.
Cars do not cover roads all the time. However, if it is a semi-busy road, then there should be less than two seconds between cars. So, let's just say any spot on a road has a car on it 1/3 of the time. Would it not be 33% more efficient to have the panel above the cars?
The glass being strong or weak really has nothing to do with this. Glass will eventually be scrached, reducing the efficientcy. Are you suggesting that they have magical glass that never scratches?
This all sounds like a scam. It sounds like these people are trying to make money off of a pipe dream, fed by green hopes.