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

http://arstechnica.com/tech-policy/2015/06/police-use-ultrasonic-device-to-make-sure-drivers-stay-3-feet-from-cyclists/
https://www.youtube.com/watch?v=APlCVp6BW60
http://codaxus.com
Nice revenue enhancement. $200 per ticket and $1400 for the hardware.
7 tickets and it's break even. I'll probably need to install an
ultrasonic detector on the right side of my car (much like a radar
detector) so that I don't get caught. Let the arms race begin.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Sat, 13 Jun 2015 21:19:05 -0700, Jeff Liebermann
wrote:

http://arstechnica.com/tech-policy/2015/06/police-use-ultrasonic-device-to-make-sure-drivers-stay-3-feet-from-cyclists/
https://www.youtube.com/watch?v=APlCVp6BW60
http://codaxus.com
Nice revenue enhancement. $200 per ticket and $1400 for the hardware.
7 tickets and it's break even. I'll probably need to install an
ultrasonic detector on the right side of my car (much like a radar
detector) so that I don't get caught. Let the arms race begin.

If it is ultra-sonic than why not an ultra-sonic device to send a
signal from the car. If they work like I think that they do they ping
a signal and measure the time it takes to get a return. If that is
correct than a "pinger" in the car should result in a much quicker
return and the device might even indicate negative distances :-)

"But Officer, how could I have been two feet to his right when I
passed him on the left?"

--
cheers,

John B.

bzzzzzzzzzzzzzzzzzz



http://arstechnica.com/tech-policy/2...from-cyclists/

http://greyfalcon.us/pictures/meetorthon[1].jpg

On 6/14/2015 12:19 AM, Jeff Liebermann wrote:
http://arstechnica.com/tech-policy/2015/06/police-use-ultrasonic-device-to-make-sure-drivers-stay-3-feet-from-cyclists/
https://www.youtube.com/watch?v=APlCVp6BW60
http://codaxus.com
Nice revenue enhancement. $200 per ticket and $1400 for the hardware.
7 tickets and it's break even. I'll probably need to install an
ultrasonic detector on the right side of my car (much like a radar
detector) so that I don't get caught. Let the arms race begin.


I like it. I'd like it even better if the cops using it were in plain
(civilian) clothes, or even in lycra kit.

--
- Frank Krygowski

On Sun, 14 Jun 2015 17:55:35 +0700, John B.
wrote:

On Sat, 13 Jun 2015 21:19:05 -0700, Jeff Liebermann
wrote:

http://arstechnica.com/tech-policy/2015/06/police-use-ultrasonic-device-to-make-sure-drivers-stay-3-feet-from-cyclists/
https://www.youtube.com/watch?v=APlCVp6BW60
http://codaxus.com
Nice revenue enhancement. $200 per ticket and $1400 for the hardware.
7 tickets and it's break even. I'll probably need to install an
ultrasonic detector on the right side of my car (much like a radar
detector) so that I don't get caught. Let the arms race begin.

If it is ultra-sonic than why not an ultra-sonic device to send a
signal from the car. If they work like I think that they do they ping
a signal and measure the time it takes to get a return. If that is
correct than a "pinger" in the car should result in a much quicker
return and the device might even indicate negative distances :-)

"But Officer, how could I have been two feet to his right when I
passed him on the left?"

Ahem... Is that like an ultrasonic jammer? That wouldn't be very
sporting. The FCC regulates RF jammers, but has no jurisdiction over
ultrasonic jamming (yet). So much for my guilty conscience.

If it's the common 40 KHz range finder type of ultrasonic transducer,
it should be easy enough to capture the transmitted burst, and return
a delayed echo that makes it look like you're further away. Some
variable delay FM junk before the returned delayed echo should
convince the receiver that it doesn't have a solid reflection so that
it will only use the strong and stable delayed echo.

Incidentally, I think some of the article is wishful thinking. Unless
the side mirror was exactly perpendicular to the beam, the return is
going to be at an angle and lost. That gives the device a very narrow
time window where it can get an accurate and stable reading. I just
tried it on my Subaru mirror with an ultrasonic rangefinder. At 3 ft,
I have to really fight to get it to give me a good reading from the
mirror. Most of the time, it wants to display the distance to the
fender or door.


--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann wrote:
:On Sun, 14 Jun 2015 17:55:35 +0700, John B.
:wrote:

:On Sat, 13 Jun 2015 21:19:05 -0700, Jeff Liebermann
:wrote:

:Incidentally, I think some of the article is wishful thinking. Unless
:the side mirror was exactly perpendicular to the beam, the return is
:going to be at an angle and lost. That gives the device a very narrow
:time window where it can get an accurate and stable reading. I just
:tried it on my Subaru mirror with an ultrasonic rangefinder. At 3 ft,
:I have to really fight to get it to give me a good reading from the
:mirror. Most of the time, it wants to display the distance to the
:fender or door.

Which is fine. If it sasy the fender is 3 ft away, the mirror was
closer.


--
sig 16

On Sun, 14 Jun 2015 17:46:11 +0000 (UTC), David Scheidt
wrote:

Jeff Liebermann wrote:
:On Sun, 14 Jun 2015 17:55:35 +0700, John B.
:wrote:

:On Sat, 13 Jun 2015 21:19:05 -0700, Jeff Liebermann
:wrote:

:Incidentally, I think some of the article is wishful thinking. Unless
:the side mirror was exactly perpendicular to the beam, the return is
:going to be at an angle and lost. That gives the device a very narrow
:time window where it can get an accurate and stable reading. I just
:tried it on my Subaru mirror with an ultrasonic rangefinder. At 3 ft,
:I have to really fight to get it to give me a good reading from the
:mirror. Most of the time, it wants to display the distance to the
:fender or door.

Which is fine. If it sasy the fender is 3 ft away, the mirror was
closer.

The side mirror housing was 3 ft away. The fender was about 3.5 ft
away. However, I see your point. The device could just measure the
fender or door distance, subtract the approximately 6 inches for most
passenger cars, and trigger at 3.5 ft. That won't work with cars,
buses, trucks, campers, cement mixers, garbage trucks, ambulances, etc
but it's a start.

The authorities could hang an additional camera pointing downward on
the overhead light poles. It's easy enough to accurately measure the
distance with an overhead camera. Requiring cyclists and automobiles
to have machine readable bar codes on helmets and roof tops should
identify the participants. Locating the cameras at known choke points
should help maximize the generated revenue.

However, the police cyclist could have hung a spring loaded antenna
from their left handlebar that is 3ft long. If it hits anything, it
takes a photo and they get a ticket. You could probably attach one to
your bicycle and issue fake warnings or threats. This sounds like
fun.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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http://img1.wikia.nocookie.net/__cb2...Meter_some.jpg

https://www.youtube.com/watch?v=4-13eZZH7Yk