It is hard to see from the video how early the guy started trying to slow down, I do think he didn't react it early enough but also not sure if reacting earlier would have made any difference. Honking would have done nothing, the crying like a little girl at least made the video funny
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Sorry,I'm confused by your English. "I do think he didn't react it early enough". Does that mean you don't think he reacted early enough? He sure as he'll didn't react early enough. He didn't try to slow down until the last minute. I've watched it a few times and the posts seem to be passing at the same speed until the last minute. He obviously was expecting the truck to correct the situation.