BABETTE VAN GESSEL says: Concepts nice but not practical. No woman would ever get into a car with a stranger (well I wouldnt) and as sociable as I can be, I really would n't want the general public phoning me or tracking my registration number. It not as benign everywhere else in the world outside of Holland. Plus the service of finding cars is already in place in Holland where you can sms the registration number to get a value of a car, so this is just taking that one step further. Sharing rides is best left to friends, colleagues or friendly neighbours.

Peter Leonard Krebs says: Have you heard of sites like comuto.com? This kind of idea is in use in France since mid-2000's and has over 2M users. Check it out!

Dan Frederiksen says: it's a nice thought and if that's what it took it would be a good idea. but a small reduction in CO2 emission will not be enough. not even close.

we need for vehicles to be entirely CO2 free and that's electric cars. and the more efficient those cars are the quicker we can have them powered entirely by CO2 free sources like windmill, solar, waterfall and nuclear.