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4.5g exceeds the threshold for a mild accident. A person, especially depending on any pre-existing conditions, can be injured with this much force.

https://www.researchgate.net/figure/Thresholds-g-forces-for-...

I believe 4.5gs would be like a 9-10mph crash.

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What percentage of 9-10mph crashes do you think result in any emergency services being called? I would hazard a guess that it's less than 50% including a non-emergency call to police and less than 10% for EMS. It absolutely does not warrant an automatic call to 911.

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