Three to Four large orb lights seen near Safford, AZ.I was driving East on I-10 with my husband in the passenger seat shortly after seeing the exit sign for Safford, AZ. Orb lights caught my eye in the sky outside my driver-side window. I saw 4 large orb shaped bright lights, and within a few seconds there were only three, and my first thought was it was a low flying plane that had turned and obscured one of the lights. Within seconds the fourth light reappeared and at that point realized I was looking at something quite unusual. I told my husband to look and he saw them for a brief second before they disappeared. Seconds later they reappeared and we watched them for a few moments before it repeated the pattern of four lights to three and then all simultaneously shut off. The orb lights seemed to move in unison, were very close but were not aligned. They were moving very slowly. My husband's description: they were very bright, very large, but not so high that they could not have been mistaken for a star or planet. He is a retired EE who worked for a top defense contractor. One of his projects included development of computer-assisted maintenance of military aircraft and he had top secret security clearance.