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What are those gizmos? Are you on camera at local traffic intersections?

ABOVE: Optical detection camera to sense approaching vehicles (white) and optical sensor to pick up the white strobe lights of a police car or fire truck (black). Photo taken on Jefferson Blvd.

ABOVE: Optical detection camera to sense approaching vehicles (white) and optical sensor to pick up the white strobe lights of a police car or fire truck (black). Photo taken on Jefferson Blvd.

NEWS-LEDGER — MARCH 6, 2013 —

By Steve Marschke
News-Ledger Editor

Have you ever seen those gizmos mounted on West Sacramento traffic poles, and wondered if they’re cameras? And, if so, who’s watching you?

There are at least three types of pole-mounted sensors around town at different street intersections. And Peter Hanson, an engineering assistant with the City of West Sacramento’s Public Works Department, reminds us that none of them is a “red light” camera. The city doesn’t currently have a “red light camera” program to catch red light runners.

So what, exactly, are these devices?

At the corner of Jefferson Boulevard and Stone Boulevard, near the railroad tracks, you may see a thing that looks like a hanging bulb. It’s one of several security cameras operated out of the Port of West Sacramento, which is serviced by the railroad.

“These cameras have a dual purpose,” reported Hanson. “’A,’, to observe the intersection (for security), and ‘B,’ to observe the traffic at the intersection.”

Aside from monitoring security, the camera’s view can be used by city staff to see how traffic light timing changes are affecting the flow of traffic, for example.

ABOVE: The all-seeing eye of a port ecurity camera near the railroad tracks and Jefferson Boulevard, north of Stone Boulevard (photos by Thomas Farley and the News-Ledger)

ABOVE: The all-seeing eye of a port ecurity camera near the railroad tracks and Jefferson Boulevard, north of Stone Boulevard (photos by Thomas Farley and the News-Ledger)

Another type of “camera” seen at some traffic-light controlled intersections is a long, white cylindrical device. Those are directly linked to the traffic light controls.

“Those are video detection systems,” explained Hanson. “It knows if a car is coming or not. It actually sees cars, and changes the light for them. It ‘sees’ through algorithms, and it looks at the differences in contrast” in its field of view.

Then there are the more numerous little black items mounted on many a local traffic light pole.

“That’s a detector for emergency vehicles,” said Hanson. “If you look at an emergency vehicles, you will see a light bar on the roof, and in the center, there is a white strobe light. In our city, the fire and police vehicles each have one.”

Those strobes on top of fire trucks and police cars can, when turned on, put out a pattern of white flashes – which is picked up by the traffic pole sensor, and earns a “green light” for that Code 3 emergency vehicle.

Ambulances serving the town can’t do this trick, said Hanson.

There’s at least one other smart gizmo on the street – or under it, to be precise.  An “induction loop” can be buried in the pavement to sense the magnetic presence of a car that has pulled up to a red light, signaling the traffic lights that they need to change.

[adrotate group=”7″]   But none of these gadgets does what a “red light camera” would do, said Hanson. If you find yourself entering an intersection illegally after a light has turned red, the “sensor” that gives you a ticket needs to be an actual police officer.

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Copyright News-Ledger 2013

Wednesday: college info night

FROM THE NEWS-LEDGER —

Freshmen, sophomores and juniors at River City High School are invited to attend College Information night on Wed., March 13, from 6-7 p.m. at the school career center. Parents welcome. There will be information on community colleges and four-year colleges and universities as well as trade schools.

Copyright News-Ledger 2013

Practice for college entrance tests

[adrotate group=”9″] FROM THE NEWS-LEDGER —

Students can practice for the SAT/ACT tests and get an analysis of their strengths and weaknesses. The event will be held at the library, 1212 Merkley Avenue, from noon to 4 p.m. on Sat., April 6, with results available at a session from 6:30-7:30 p.m. on Thursday, April 18. Stop by the library, call it at 375-6465, or visit www.kaptest.com/college.

Copyright News-Ledger 2013

Free: RCHS plays at Raley Field

Senior Jason Wullenwaber on the mound for the River City varsity (News-Ledger file photo by De'Onna Jack)

Senior Jason Wullenwaber on the mound for the River City varsity (News-Ledger file photo by De’Onna Jack)

FROM THE NEWS-LEDGER

Raley Field will play host again to a round of high school baseball games this spring. The River City High School team from West Sacramento will be at the minor league park to take on Linden High on April 13. The junior varsity matchup is at 4 p.m. and varsity plays at 7:30 p.m. Admission and parking are free; teams will be selling River Cats tickets as a fundraiser. Visit www.rivercats.com/highschool.

Copyright News-Ledger 2013