What can I do to make my neighbor stop letting my child riding on their truck's running boards?

Question Details: I caught my 10 year old son riding on the side of a truck standing on running boards hanging onto window outside the door. I have asked the neighbor to stop this and never do it again but they did it anyhow and I saw it for the second time. Our kids play together and it's almost impossible to keep them from being friends an d hanging out but I have a problem with this and they dont care how I feel they live directly across the street. I am at a loss for getting through to them on dangers of this and I question their judgement completely. He said I was holding onto him. I have a few expletive thoughts at this time. Is there a way to protect myself and child from this? Who can I get help from here?

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