Where Would You Locate a Camera To View Over a Vehicle Gate?

I am trying to come up with the best solution for viewing vehicles entering through a gate. The purpose is to be able to view who's fault it is for any damage to a vehicle caused by a closing gate. I personally think the gate gives you sufficient time (and then some) to enter so I don't believe the gate is closing too quickly however, there have been several claims that the gate has damaged the vehicles for one reason or the other.

There are two posts at the gate, one that sits within the gate area (Red X), and the other that sits outside and is a lamp post (Green X). The client initially wanted us to put a camera at the highest point possible on the lamp post. The lamp post is probably 25 ft high. There is another post that sits within the gated area where the gate swings open. The problem is that the post is about 15ft high but sits approximately 4 feet from where the gate opens completely. So this post does not provide a "line" view of the gate completely open while the vehicle drives through. The problem with the lamp post is that there is a guard shack that may block the view of the vehicles driving in.

I have attached a picture with some added commentary to give you an idea. My apologies for such poor detail but I only just now thought about posting on IPVM. I know, shame on me.

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