Surveillance Cameras In Traffic Tunnel Recommendations?

I'm involved with a project to deploy of a series of surveillance cameras in an 8-lane freeway tunnel, and I'd like to ask this esteemed group a few related questions, please.

  1. Has anyone used video analytics to help monitor traffic conditions, and how well did it work?
  2. Better to ceiling mount cameras 21' above road surface, or wall mount at a lower elevation?
  3. Is there practical benefit of using a thermal camera?
  4. Suggested distance between cameras along the roadway?
  5. Possible surveillance interface with traffic management system?

Thanks in advance!

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