Arrow Boards on the 4th July

When you think of the 4^th of July, you probably don’t think about arrow boards.  But, on this trip to Ohio I feel like I am going to end up seeing more arrow boards than fireworks.

So far I have been driving for about 2 hours (actually less) and have seen at least 10 arrow boards.  This is not including the arrow boards I have seen on trucks and plows.