Contrail is a fun little gadget developed by Studio Gelardi to let bicyclists "mark" their bike paths. As more an more bikers ride on the same path, the contrail lines get brighter. Ostensibly, they say that the gadget allows other bicyclists the path that is safe to ride on but I’m sure that a big part of the appeal is the sheer fun in making roads look like Skittles rainbow.
Link – via Gadget Lab
Foreigner1
I’m sure that in most overregulated Western countries this gadget will be considered highly illegal – ney, dare I say CRIMINAL!, just like graffity.
Cute idea! Bit like the trails that ants make vor eachother to food. The more ants go some trail, the stronger the tracks become, the more urgent more ants will follow it. Nice!
Flux
Cyclists are a far more awesome crowd than graffiti taggers…but that still doesn’t give them any more right to graffiti. Sorry guys, laws have to apply to everyone. 
nosaukums
Actually it is just chalk, there fore it is not a graffiti/illegal painting.
Chalk is allowed everywhere. Otherwise, lot of kids in the prison.
Viola
That’s true, nosaukums, but I’m pretty sure that this could cause problems if over-used on, say, city streets where there isn’t much room to begin with.
Peeves
I can’t imagine it becoming so popular to be disruptive. It’s another thing to buy and restock on..I can’t imagine the chalk on that lasting more than a day..unless you can adjust it forward when it wears down. Even then, you’d have to reload it quite often..that’s a lot of revolutions.
Johnny Cat
Yeah, to think chalk would be an issue in PDX is actually hilarious. We’re done with it and worry about duct tape.
Portland rocks.
error404
Actually as a person who funded there way through art school by “screeving” AKA pavement drawing in chalk, I can tell you that in a lot of places pavement drawing is not allowed.
That is why you see the people with the huge bits of paper taped down to the pavements nowadays. They get into trouble if they don’t.
SO the bike contrail thing is absolutely destined to fall foul of the law.
Hell in Australia they seem to now want cyclists to have registration plates,insurance,road tax, and pass road worthy testing, so I think the days of carefree cycling are pretty much numbered.
Frau
I have an artsy alternative, that should not get you into trouble and will make your bicycle just as fun.
Send me 30 bucks and I will send you a kit that makes your bicycle sound like a motorbike.
Jezebel
I think I’ve spotted this before on Neatorama- With the caption that it seems like a good way to make art.
If only I could remember where!
It’s supersweet anyhow. 
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