parnass@ihu1h.UUCP (Bob Parnass, AJ9S) (05/10/86)
x
Spoofing Traffic Lights
Here's the scenario:
I'm stopped at an intersection, waiting for the light
to turn green. No one else is around. The light seems
to be red for an eternity, but there's no traffic.
I back my truck up a few feet, off the sensor loop buried
in the roadway, then drive back over the loop a few
times. This will usually cause the traffic signal to
become green.
--
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Bob Parnass, Bell Telephone Laboratories - ihnp4!ihu1h!parnass - (312)979-5414jimb@drutx.UUCP (Jim Bryant) (05/10/86)
In article <840@ihu1h.UUCP> parnass@ihu1h.UUCP writes: > Here's the scenario: > I'm stopped at an intersection, waiting for the light > to turn green. No one else is around. The light seems > to be red for an eternity, but there's no traffic. > I back my truck up a few feet, off the sensor loop buried > in the roadway, then drive back over the loop a few > times. This will usually cause the traffic signal to > become green. if there's no traffic, i just go on through :-) at&t information systems/denver colorado/jim bryant - k6 ...!{ihnp4,ulysses,mtuxo,pegasus,whuxl}!drutx!jimb -- le mieux est souvent l'ennemi du bien
jawa@ihuxl.UUCP (James A. Wadas) (05/12/86)
> x > Spoofing Traffic Lights > > Here's the scenario: > > I'm stopped at an intersection, waiting for the light > to turn green. No one else is around. The light seems > to be red for an eternity, but there's no traffic. > > I back my truck up a few feet, off the sensor loop buried > in the roadway, then drive back over the loop a few > times. This will usually cause the traffic signal to > become green. > -- > =============================================================================== > Bob Parnass, Bell Telephone Laboratories - ihnp4!ihu1h!parnass - (312)979-5414 Photovoltaic cells sometimes react when you "flash your brights" on an upcoming traffic signal so equipped. Deserted intersections at twilight provide the best conditions for this phenomenon. -- James Wadas @ AT&T Bell Laboratories -- Naperville, Illinois (312) 979-0240 ...!ihnp4!ihuxl!jawa
john@anasazi.UUCP (John Moore) (05/14/86)
In article <840@ihu1h.UUCP> parnass@ihu1h.UUCP (Bob Parnass, AJ9S) writes: >x > Spoofing Traffic Lights > > Here's the scenario: > > I'm stopped at an intersection, waiting for the light > to turn green. No one else is around. The light seems > to be red for an eternity, but there's no traffic. > > I back my truck up a few feet, off the sensor loop buried > in the roadway, then drive back over the loop a few > times. This will usually cause the traffic signal to > become green. I use this trick all the time. It works most of the time - especially in a left turn lane. I think it is technically illegal to back up in a traffic lane, however. -- John Moore (NJ7E/XE1HDO) {decvax|ihnp4|hao}!noao!terak!anasazi!john {hao!noao|decvax|ihnp4|seismo}!terak!anasazi!john terak!anasazi!john@SEISMO.CSS.GOV (602) 861-7607 (day or evening) 7525 Clearwater Pkwy, Paradise Valley, AZ, 85253 (Home Address) The opinions expressed here are obviously not mine, so they must be someone else's.
cem@intelca.UUCP (Chuck McManis) (05/15/86)
> > Photovoltaic cells sometimes react when you "flash your brights" > on an upcoming traffic signal so equipped. Deserted intersections > at twilight provide the best conditions for this phenomenon. > James Wadas @ AT&T Bell Laboratories -- Naperville, Illinois Yes and some have photovoltaics "tuned" to the stroboscopic frequency of emergency vehicles. This allows the light in front of a fire truck to change for it, thus speeding up response time. --Chuck -- - - - D I S C L A I M E R - - - {ihnp4,fortune}!dual\ All opinions expressed herein are my {qantel,idi}-> !intelca!cem own and not those of my employer, my {ucbvax,hao}!hplabs/ friends, or my avocado plant. :-}