How does that work in rural areas? Microcells all the way down the highway at regular intervals?
Microcells are good for carrying lots of traffic from lots of mobile stations. In rural areas, coverage at the lowest cost per square mile is more important. Also, farmers aren't always near the highway, so microcells on the highway would not work well for them.
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They can be built into decorative lighting poles such that you would really have to pay attention to notice them.