Here's another sign you won't see around here. It's purpose is simple, it signals drivers when it's their turn to enter the highway. The sign cycles slower as highway traffic gets heavier and more quickly when the coast is clear. As the sign below says, only one car is allowed to enter at a time and this helps the merging process be more effective.
Of course, only highways with ridiculous volumes of traffic, typically around the morning and evening rush hours, need this type of assistance. So if in your travels you encounter a ramp meter at the wrong time of day, calm down and enjoy the view. You're not going anywhere very fast.
https://en.wikipedia.org/wiki/Ramp_meter
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