Middle-of-the-road for engineers. The industry is gobbling up new technology like mad, and there is a huge need for interested IT types. Especially for infrastructure security. Every State DOT, County, and City is woefully behind the curve where internet/infrastructure security is concerned. I suspect a well qualified…

Sound activated preemption detectors had a toehold in the market a long time ago. Do you recall how long ago this was?

Hah! I haven’t heard about that one for a long time!

They are supposed to connect a sense wire from the emitter to the parking brake system, which deactivates the emitter when the emergency vehicle is parked.

The controller does not count cars approaching the stop bar when the phase is red, is my point.

So let me ask you - How would a stop bar detector counting cars even work? When the phase is displaying a red light, the first car to arrive at the stop bar rolls over the detector and stops. Any successive cars roll up and stop behind that first car, no further cars roll over the detector, so no more counts…

Almost none of that is factually correct.

The wheels, whether steel or aluminum, are the easiest part to detect, due to how an induction loop works. It’s all about eddy currents. A large continuous loop of metal (e g. a car wheel) is ideal for responding to the induced current change required to get detection.

That’s not what the advance loop is for. The controller is not sensing the advance loop until the light for that lane is green.

The controller does not care how many times the stop-bar detector is actuated. It is not counting cars at that point.

I am sure. From the text of 109-59, the SAFETEA-LU transportation act of 2005:

Good question, and the answer is that even without cameras, the invalid code is still logged and time-stamped.

Yes. Also, the cameras are neither inexpensive, nor are they easy to install. A complete system for a typical four-legged intersection costs about $20K installed. Because the cameras are now FLIR, but even before FLIR they were about $700/pop due to the heavy-duty weather resistant housings and the general high…

Opticom is one brand name for the infrared detectors.

Call me weird but I think it has aged very well. Mrs. Adequate disagrees, but she drives a CR-V.

Hi Jason, it’s me again, here to rave about the awesome Nissan Pulsar with the optional SportBak. Okay, it wasn’t a true panel-van as it did not have openable rear doors. Instead the whole hatch-canopy thing opened upwards. But damn, it had a ton of cargo room. Also, take off the hatch completely, pop off the T-tops,…

Backlight.

So, jeez, I’m not gonna wade through all 162 (at this time) replies and replies-to-replies.

I asked an ODOT worker how often they have to go pull a truck out and regrade one of the runoffs, he replied “weekly”.

So many of them.