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| Man fined for criticizing govt using science, without a license |
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| Someone:
--- Quote from: retrolefty on May 04, 2017, 02:21:17 pm --- --- Quote from: Raj on May 04, 2017, 10:29:34 am ---As far as I know and what I think,it's not the engineers who are supposed to choose a delay for the lights, an engineer would get instruction from the municipality and civil architects, to create a street light with so and so long delays. He could give a suggestion but the ultimate decision isn't his --- End quote --- More importantly there must (should) be a timing standard for the town, so should be codified in local law or regulation (50 different State laws, sorry that's how it works in US) such that all intersection lights use the same timings for the same posted speed roads. I've noticed that the timing is dynamic and on-demand for some major expressways in my area, giving timing preference in commute direction and time of day. Whoever writes the PLC code for the lights must get the timing specifications from the 'customer', it's not a software designer decision. This is in reality a PLC software issue not a EE decision. --- End quote --- Its typically the work of a Civil Engineer, laying out the shapes and determining the timings. As with most large projects there is a lot of attempts in simulation before actually deploying it. |
| ez24:
If someone has a B.S.C.E. degree but not a P.E. are they an engineer? |
| Richard Crowley:
--- Quote from: ez24 on May 05, 2017, 05:20:20 am ---If someone has a B.S.C.E. degree but not a P.E. are they an engineer? --- End quote --- That depends on where you are and who you ask. If you ask the state of Oregon, then no, you are not an "engineer". |
| EEVblog:
IEEE Articles: http://theinstitute.ieee.org/ieee-roundup/blogs/blog/mats-jrlstrm-i-am-an-engineer http://theinstitute.ieee.org/ieee-roundup/blogs/blog/does-having-a-license-make-you-an-engineer |
| james_s:
The timing is not hard coded into the firmware and it's not a generic PLC. Traffic control units are purpose built programmable devices and the timing is configured in the field. My uncle spent a majority of his career as a signal electrician and installed and maintained a lot of these systems and I've still got an old Honeywell controller from the late 70s in my garage that he gave me when I was a kid. I don't know who decides what the timing is supposed to be but it isn't the signal electricians who set the things up. He had some amusing stories, one of his coworkers once programmed a controller that had gotten corrupted after a power outage as happened occasionally with the older ones. He got the timing off by an order of magnitude so the amber light was only 0.3 seconds long instead of 3 seconds, somehow didn't notice until people started complaining to the city. This was of course back before red light cameras were an issue. |
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