OK, this is not rocket science. Anyone with average driving skills and experience SHOULD be able to judge which vehicle will arrive at the merge point first, or is there is a likelihood of arriving at the same time. When driving my cart, I am watching the mirrors approaching a merge, and if it is clear that one or the other vehicle will clearly get there first, there is no problem. If it looks like a tie, I slow down a bit and wave the other vehicle on. If I see that a car going 30 is clearly accelerating to 45 to "race" to the merge, I merge early, then gradually slow down to 8 or 10 mph just to send a message--that being that you cost yourself double the time by being a jerk.
It's basically the same as driving on a 2 lane interstate. If I'm in the right lane with cruise control on and approaching a slow vehicle while someone in the left lane is approaching me, I just judge whether he will pass me easily, will never catch up, or if he is going to get along side me and box me in. In the latter case I just change lanes earlier than I need to.
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