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Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

arstechnica.com

11–20 of 71 posts

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#11
post #9

What I find more interesting than the device is a quote from the officer, "Their attitude will determine whether I issue a citation. If they take it and just throw it on the seat, then I know I wasn’t effective. Then in that case I would issue a citation." Does this seem extremely subjective and arbitrary to anyone else?

Yeah, I don't see how pretending to read a pamphlet in front of the officer demonstrates understanding or future compliance.

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#12
post #4

If the police are measuring with ultrasonic rangefinders, then cars need them too. How are human drivers supposed to judge that distance? The article makes the analogy of trying to enforce speed limits without a radar detector. Fine, but cars have speedometers that give the driver the same information. We don't demand drivers just get a feel for how fast they are going.

Judging 45 miles per hour is a lot different (and difficult) than knowing how far three feet is.

I think the device is used partly as education, partly as a method for capturing the exact distance. It's less about "how far is three feet?" and more "I have proof you were closer than three feet".

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#13

California has the same law. This is a great way to get tools into the hands of police to help them enforce the law and educate drivers.

And if you decide to ride in the middle of a lane while on a bike, should the car drive in the other side of the road to pass you? This tool is arbitrary and will not change the problem, lack of dedicated bike lanes.

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#14
post #4

If the police are measuring with ultrasonic rangefinders, then cars need them too. How are human drivers supposed to judge that distance? The article makes the analogy of trying to enforce speed limits without a radar detector. Fine, but cars have speedometers that give the driver the same information. We don't demand drivers just get a feel for how fast they are going.

The 3 feet is a minimum. The idea is just to leave a reasonable amount of room. If someone passed a post at speed with only 3 feet of clearance they would be checking to see if their mirror was still there.

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#15
post #8

PA law is actually four feet, but given the width of bike lanes this is sometimes physically impossible.

It's not impossible. If there isn't a safe distance to pass a cyclist you have to wait until there is a safe distance.

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#17
I realize this is quite an aside from the topic of the article, but... it's beautiful. It looks like something straight out of the "maker" movement: Appropriate use of off-the-shelf components, rugged enough for its use, "do things that don't scale" manufacturing, and probably appropriately designed for the anticipated number of units needed, numbering maybe a half dozen at most.

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#18
post #6
post #4

If the police are measuring with ultrasonic rangefinders, then cars need them too. How are human drivers supposed to judge that distance? The article makes the analogy of trying to enforce speed limits without a radar detector. Fine, but cars have speedometers that give the driver the same information. We don't demand drivers just get a feel for how fast they are going.

I do it by overcompensating so there is no chance I am too close to the cyclist. If there is not enough room (e.g., oncoming traffic) then I wait until there is an opportunity. I can't see cars broadly introducing this technology before we're not the ones driving them. FWIW, I worked on a "citizen jury" that recommended the adoption of the one-metre passing rule in my state. The default opposition on the jury was "wh…

Hear, hear. There have been times that I'm certain the cyclist I was waiting to pass was annoyed that I wasn't passing in city traffic but the law says three feet so I give them three feet. In the main it's because if I passed with less than three feet and something happened, including the cyclist losing control, I would, of course, be crucified by law enforcement and the cyclist, assuming they survived the incident.

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#19
post #4

If the police are measuring with ultrasonic rangefinders, then cars need them too. How are human drivers supposed to judge that distance? The article makes the analogy of trying to enforce speed limits without a radar detector. Fine, but cars have speedometers that give the driver the same information. We don't demand drivers just get a feel for how fast they are going.

There are many laws like that, following too close comes to mind. If in doubt, wait to pass until you're sure you have room.

Re: Police use ultrasonic device to make sure drivers stay 3 feet from cyclists

#20
For the entrepreneurs here, I promise to order a $200 version of this. Ideally it'd just be a mount I'd drop my phone into so that I could, say, pair it with Bluetooth and have an app that simultaneously records video with overlaid range and GPS information. I would pretty much immediately start documenting the routes I ride.
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