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by 11ren 6356 days ago
hey, that's really cool. I like your point that it's lateral visibility that matters. But I think in practice, the side of the bike is visible only for a very short time (as a car passes it), and the driver is looking forwards (not to the side). The bike needs to be visible from behind.

Another projection idea is a downward-facing rear light - perhaps angled so that the light reflected from the road hits the eyes of the drivers behind?
1 comments
silentbicycle 6356 days ago
I've biked as primary transportation for five years (including through Michigan winters), and in my experience ensuring that other drivers see you at intersections is most important. They're often unclear about intent, who has right of way, etc., when they see you at all, and that's where paths cross.

Being visible from behind is also important, but doesn't take anything extravagant: A five-red-LED blinker on your bike and a blinker on your helmet or large reflective strips on your bag is almost certainly sufficient. As long as you're not weaving from lane to lane and not terribly unlucky (e.g. being followed by a drunk or a car full of reckless teenagers), it's unlikely you'll get hit from behind.

(Fog/glow under the bike would be awesome, though.)

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11ren 6356 days ago
OK, your empiricism beats my theorism.

Thinking of my own experience (I've ridden daily for a couple of years), the only two close-calls I've had are from a car that's in front of me, when it suddenly sees a parking spot, and swerves across, almost side-swiping me.

I could probably avoid this by riding in a full car lane, instead of to the left of it (between the lane and parking spaces), but it seems wasteful to take up a whole car lane (and I can't pass cars then). Also, what I'm doing may be illegal, as it's not marked as a bike lane.

(Bonus: fog/glow is more visible when raining.)

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silentbicycle 6356 days ago
1. I don't know why I didn't check Instructables sooner. :) http://www.instructables.com/id/DIY-Glow:-Ground-Effects-Lig...

2. Barring unusual state laws, taking the lane is usually legal. IIRC, in Michigan the law says something handwavey about riding as far to the right as is safe and practical. I will generally take the lane (right lane if there's two, or a wide shoulder), but try to be cognizant of traffic buildup behind me. Riding in a manner that seems predictable to drivers contributes more to safety than following the law to the letter, anyway. Route choice probably also makes a big difference.

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11ren 6355 days ago
1. That glow ground effect is pretty much what I was thinking, except, for the glow source to not be visible itself - you just see a mysterious glow from under the bike.

Easy enough to shade the sides (perhaps with a reflective surface, so as to not waste the light). Of course, being more visible makes it better - just doesn't look as cool (IMO).

But also, it doesn't give a sense of the space around the bike. That was the main idea I got from the original article, of a projected "lane" - it's not to make the bike more visible, but to display a cushion of space around it (a territory), so cars don't drive too close.

2. I meant it was illegal what I do (which is to ride between the parked cars and single lane of the road. Also a danger of a parked car's doors opening). I agree with your other points (esp route taken!)

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11ren 6355 days ago
1. That glow ground effect is pretty much what I was thinking, except, for the glow source to not be visible itself - you just see a mysterious glow from under the bike.

Easy enough to shade the sides (perhaps with a reflective surface, so as to not waste the light). Of course, being more visible makes it better - just doesn't look as cool (IMO).

But also, it doesn't give a sense of the space around the bike. That was the main idea I got from the original article, of a projected "lane" - it's not to make the bike more visible, but to display a cushion of space around it (a territory), so cars don't drive too close.

2. I meant it was illegal what I do (which is to ride between the parked cars and single lane of the road. Also a danger of a parked car's doors opening. I agree with your other points (esp route taken!)

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