I have had to replace my mailbox and mailbox post at an ever increasing frequency, due to driver distraction. The standard mailbox and post are as far back from the road (straight and only 35 MPH) as possible with the mailman in his truck still able to reach it. That has not stopped distracted drivers from going off road and smashing my mailbox post. The only time drivers stop and own up is when their vehicle is so damaged that they cannot drive away and the police show up. Drivers who have owned up are typically women on cell phones, although one claimed she was eating a banana at the time. Even the cheap poly vinyl post and alum mailbox I use costs $90 each time. I just bought a $39 steel self-driven mailbox post that is hammered 18" into the ground. The metal arm/bracket (for the box) has holes for two bolts, but I only used one bolt to attach the bracket to the arm. I then attached an extended treated wood 1x4 to the metal bracket with four screws. The wood extension lets me set back the post 24" further from the road with the mailbox on the end of the plank, at the same distance from the road as before (same reach for the mailman from his truck). To hit the set back post now, a driver would have to go through an existing uproad telephone pole first, i.e. a telephone pole is blocking for me. If the mailbox/1x4 are struck, the plank and bracket will pivot on the arm due to the one bolt attachment, sparing the metal post from torque damage. The alum mailbox and 1x4 will only cost about $10 to replace each incident.