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What are those black things that show up, that cross the entire road?

So for months and months and months the road is clear. Then one day when you are driving you run over these two black things that are mounted to the road, and they are long enough that they cover both lanes.

Are they for getting speed limits of vehicles, and then they store that data, or send it back to somewhere? I've never known what they are, maybe you do, and you can explain it better than I can?
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BackyardShaman · 61-69, M
It’s a counter, they use results for traffic planning, decisions. Often after you see these there’s a new stop sign, traffic signal, or paving.
twiigss · M
@BackyardShaman Well the only problem I have is that it doesn't make any sense for why those are where they are on the road. We've lived here for 25 years and this is the first time I've seen those counters on this road, in this one spot. They're right in front of someone's home.
BackyardShaman · 61-69, M
It could be for something further down the road??@twiigss