Final answer:
When being passed on both sides while driving at 55mph in the center lane, it's best to move to the right lane, following driving etiquette that faster traffic should be on the left and slower traffic on the right.
Step-by-step explanation:
If you are continually being passed on the right and the left while driving in the center lane at 55mph, the proper action to take would be to move to the lane on your right. This is because traffic generally flows such that the leftmost lanes are used for faster-moving traffic, and the rightmost lanes are for slower-moving vehicles or those who are preparing to exit the highway. By moving to the right, you are aiding in maintaining the organized flow of traffic and adhering to driving etiquette that keeps roadways safer. The center lane is typically used for slower speeds or for making left turns, so if you are being passed on both sides, it indicates that you are in the wrong lane for your speed. Moving to the right lane will allow faster traffic to pass you safely.