How big should signs be on the side of a road indicating an arrow for assistance in finding a birthday party?

Question

Thanks with everything going on i totally forgot about balloons as an option.

Answer 1

I do that too with balloons.  I live off a rural road from a main road going 55 + MPH. I put balloons at the signs pointing to my street.  And prior to that put balloons at the nearest cross street with arrows.  At my street sign put balloons and my house with my address.  The different colors attracted them and also draw balloons on the invitation and say follow the balloons.  

Answer 2

At 55..they need to be HUGE. How about emailing or mailing maps to the guests.  

Answer 3

tie balloons to a road sign at each turn with an arrow pointing to the direction they need to turn.  I think it's universal party directions, but I may be mistaken.  Ha!