Except the border in 4.2.3 depends on enemy player's intentions, don't you get this still? He indeed wouldn't go to the flag. Or would. Lets ask the driver and do same thing for everyone else in such cases? The remark about the only road is of no value, anyone can tell that road for him is everywhere he rides. Game allows to ride in forests with same speed as on open ground. I always thought the solution if you not sure is to get ruleset and read it, but seems like it works different for some people. This "easy solutions" recommending something like "stay away!", "don't try to find the border!" is what produce future ambivalent cases.