there should be road signs that warn you to beware of oncoming road signs.
i recently noticed that my attention was diverted from the act of driving for an extended period (more than 10 seconds) by a flurry of road signs that spelled out the road rules, route directions, speed limits and toll amounts etc, and i was infuriated that i had to come to complete halt and reverse back up to read them all, and i was very nearly "rear ended" by people who were not as interested as i was about the directions written on the signs..