6 ms·

But highly susceptible to unauthorized use. The app version can also alert drivers directly with an audible alert that an emergency vehicle is close by

cadamsdotcom 1y ago
Fixable by taking a picture of every opticom user?
- 0_____0 1y ago
  Or by doing even a slight amount of encoding of the IR signal. Transmitting a single byte as a key (set by region, same as fire dept. elevator keys) would be enough to prevent people from using their TV remote controls or whatever to trip the preempt sensors. That being said, this is kind of a non-issue already, I have heard a story about someone abusing the preempt sensors like 10 years ago and never since then. Maybe there already exists an encoding scheme.
  - SteveNuts 1y ago
    Anecdotal of course, but in my 20 years of driving I've never once seen a vehicle activate the red light override sensors that wasn't obviously a legitimate emergency vehicle. IMO a huge majority of people realize how illegal it would be to mess with these things, and the risk/reward is very low. Anyone who would take that risk would probably just run a red light instead.
    - kortilla 1y ago
      It’s a pretty serious federal crime to impersonate an emergency vehicle at those. So definitely worth just running the red.
epiccoleman 1y ago
Long ago I used to read i-hacked.com with great interest. They had an article about a DIY "MIRT" which produced the right infrared signal to trigger these: https://web.archive.org/web/20060317013200/http://www.i-hacked.com/index.php?option=com_content&task=view&id=176&Itemid=44 https://web.archive.org/web/20060317013200/http://www.i-hack... Of course this article came with many disclaimers that to actually do this would be very illegal. I was more than a little sad when I typed i-hacked.com into the browser and got redirected to some etsy page. Thank goodness for the Wayback Machine, I guess.
LadyCailin 1y ago
Not really a real problem that actually happens, but you could fix it by only making it work with visible light pulses. Sure, people still might use it illegally, but you couldn’t be very subtle about it.

cadamsdotcom 1y ago

Fixable by taking a picture of every opticom user?

0_____0 1y ago
Or by doing even a slight amount of encoding of the IR signal. Transmitting a single byte as a key (set by region, same as fire dept. elevator keys) would be enough to prevent people from using their TV remote controls or whatever to trip the preempt sensors. That being said, this is kind of a non-issue already, I have heard a story about someone abusing the preempt sensors like 10 years ago and never since then. Maybe there already exists an encoding scheme.
- SteveNuts 1y ago
  Anecdotal of course, but in my 20 years of driving I've never once seen a vehicle activate the red light override sensors that wasn't obviously a legitimate emergency vehicle. IMO a huge majority of people realize how illegal it would be to mess with these things, and the risk/reward is very low. Anyone who would take that risk would probably just run a red light instead.
  - kortilla 1y ago
    It’s a pretty serious federal crime to impersonate an emergency vehicle at those. So definitely worth just running the red.

epiccoleman 1y ago

Long ago I used to read i-hacked.com with great interest. They had an article about a DIY "MIRT" which produced the right infrared signal to trigger these: https://web.archive.org/web/20060317013200/http://www.i-hacked.com/index.php?option=com_content&task=view&id=176&Itemid=44 https://web.archive.org/web/20060317013200/http://www.i-hack... Of course this article came with many disclaimers that to actually do this would be very illegal. I was more than a little sad when I typed i-hacked.com into the browser and got redirected to some etsy page. Thank goodness for the Wayback Machine, I guess.

LadyCailin 1y ago

Not really a real problem that actually happens, but you could fix it by only making it work with visible light pulses. Sure, people still might use it illegally, but you couldn’t be very subtle about it.