I know this map, I saw it two weeks ago. In my opinion this map is meaningless. On this map tags is too many, all arrows hide everything. It seems to me, when author this map, done regular points, not big arrows
The arrows are either pointing
Away From or
Towards the location of the jump, but either way, the "Tail" on the arrow is always pointing to the location of the jump and the "Head" of the arrow is always showing the direction you need to be traveling, and the Color of the arrow tells you what type of jump it is, dirt/grass, metal, pavement, etc.
Examples:
46 and 47 both are pointing toward the same bridge, showing that you need to cross it both directions to get both jumps, east and west.
25 and 26 are very close to each other, based on where the Tail of the arrow is pointing, but you need to head in opposite directions to get them both, north and south.
So, in review, the tail of the arrow, when present, shows the location of the jump. Or, if there is no tail, then you go to where the point of the head is.
The author of the map had to use these combined arrow types in order to get them all to fit.