![]() The signals typically displayed green, then either a short "dark" interval before displaying red, or red overlapped the green display for about 3 seconds before the signal went to red. Two color signals had no yellow light section. Anyone interested in posting additional links to old signal sequence videos is welcome to add to this information base. ![]() If any cam face was slightly untrue, the color it controlled might stay on a little too long or went dark a little too soon, and that's the way the signal displayed.Īctual videos of these sequences are viewable from the YouTube links that appear on this page. Die cut controllers produced "warts and all" displays since the cams turned slowly, usually at a constant 1-RPM. The movement was so swift that minor faults in the cam shaping were virtually unnoticed. Ratchet cams were turned by a ratched solenoid that quickly advanced the controller camshaft a specific distance each time a clock key called for a display change. These were most commonly found in the bases of self contained 4-way signals although they were occasionally to be found in small pedestal or pole mounted cabinets when used to power multiple heads. ![]() Die cut, or Synchron controllers were a series of simple die cut cam lobes held onto a common shaft and turned slowly by a small clock or timer motor. Ratchet cam controllers had cams that could be configured in the field and were commonly found in traditional pedestal or pole mounted controller cabinets. There were basically two common types of controllers back then, what we called "ratchet cam" and "die cut." We distinguished between the two since both types were electromechanical. I grew up in an age when some really funky signal sequences were pretty common. Check that there is no oncoming traffic before you proceed.Old Timey Traffic Signal Sequences Willis Lamm's Before turning, check for other traffic moving in from your right.Īt a right filter traffic light, when the arrow comes on, you may turn right regardless of any other lights that may be showing. The arrow may indicate a priority to the left, right, or ahead.Īt a left filter traffic light, when the arrow comes on, you may turn left regardless of any other lights that may be showing. They may be timed to control traffic congestion at busy times. Filter Traffic Lightsįilter lights indicate that you have priority in the direction shown by the arrow (see image right, which indicates a right filter lane). However, if your exit road is blocked, wait at the stop line, do not drive forwards, and block the junction. If the green light stays on, continue, but remember to check in all directions. When approaching, be aware of what is happening behind, slow down and be ready to stop if the light changes. Remember, a green light can change at any time. you're so close to it that pulling up might cause an accident.Use the MSM/PSL routine as you approach, look for any lane markings and get into the correct lane in good time. ![]() Never speed up to try and reach a green light before it changes. Approaching Traffic LightsĪs you approach traffic lights, you should always be ready to stop. When the traffic light turns green, traffic waiting at the first stop line should be patient and allow time and space for the cyclists or buses to move off. These allow cyclists, and sometimes buses, to wait ahead of all other traffic, usually in an area marked by a different coloured road surface.Īll other traffic must wait behind the first stop line and should avoid waiting in the marked area. ![]() Some traffic light-controlled junctions have advanced stop lines. In such a case, you should be prepared to stop and give way. When a set of traffic lights have failed to work you should treat the junction as an uncontrolled junction - one where no one has priority. You can only pass through an amber light if you have already crossed the stop line or are so close to it that stopping might cause an accident.ĭo not pass through until green shows. You may continue ahead but only if the way forward is clear. ![]()
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