View Full Version : Traffic lights that detect bikes

06-02-2014, 03:23 PM
Does anyone know whether they cost more than "normal" car detection systems?

Does anyone know what ArlCo's policy on car detection at lights is?

I'm thinking of writing in about the light at 50 and Irving (it's dangerous to bike over to the button on the north side of 50, and I hear they may not install a bike detector. grrrr), and generally advocating that ArlCo install bike detection whenever it redoes a traffic light, absent a good justification, at least on designated bike routes. Those two pieces of info would help.

Oh, and in case others forgot, it's the first Monday of the month, so ABAC meeting tonight @ Courthouse. :-)

06-02-2014, 03:48 PM
Apparently, it is a question of adjusting the sensor properly, rather than requiring a different kind of sensor (http://www.phred.org/~josh/bike/SignalDetection.html). The only extra cost would be if the jurisdiction chose to mark the "sweet spot" that a bicycle should aim for in order to trigger the signal.

06-02-2014, 09:14 PM
I'm pretty sure there is an evil bike sensor on the light at the intersection of Yorktown Blvd and N. Harrison St (at the bottom of a hill).. The light always turns red when it senses a bike approaching so you cannot use any of the momentum from coming down the hill to help you up the next hill. The designer of this sensor must be the same person who put "bike routes" on the hilliest streets in North Arlington...

06-03-2014, 01:56 PM
I think Arlington prefers to put in video detection instead of inductive loop detectors for cyclists, but I'm not 100% certain.

06-03-2014, 03:29 PM
FWIW, my sources told me last night that the cost is negligible if they're installing a new system (v. upgrading an existing system), and that there's no good reason Arlington would not include bicycle detection whenever installing a new signal.