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Portable traffic lights.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...t_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ffic_light.jpg
Previously:
https://www.homemadetools.net/forum/...890#post105702
https://www.homemadetools.net/forum/...564#post139437
https://www.homemadetools.net/forum/...159#post165239
https://www.homemadetools.net/forum/...932#post156691
https://www.homemadetools.net/forum/...430#post158446
Encountered those before, across Illinois, Texas, Ohio, Pennsylvania; typically where road work is going on, especially two lane roads and bridges. They'll divert traffic to one side while holding opposing cars in place, then switch to accommodate that line of vehicles. Some look centrally manipulated, others with signalmen at each end linked by 2-way radio.
I'm sure there were accidents when manual signalmen were not in sight of each other.
I remember (before I was old enough to drive) that they would hand a flag to the last car let through. That would signal the guy at the other end to let the line waiting to start to move.Quote:
Originally Posted by Toolmaker51
Yep, I remember that, I got so excited once when we were the last car in line and I got to hold the flag. Was maybe 5 or 6, the years blur when we have seen so many.