Heading south toward Ft Randall Casino hotel. My navigation unit said I would arrive at 0130 hrs. Did not get there until around 0400 hrs. just north of Yankten a strobe appeared outside my passenger window. I thought it was on top of a tower until it started moving with my truck. I first thought it to be perhaps some type of military driod. I spoke out loud and told it if it is friendly I would talk, if it is unfriendly to LEAVE NOW. It had 2 grey bars like an upside down plug. From these a wing would extend out within the orb. The pulses were 1 per second. How I lost time I do not know. I remember putting my car into drive and driving through Yankten and the orb fell behind and followed me crossing the street a few times and hovering in the trees. South of Yankten the bright orb met up with a peach coloured orb about 10 feet away from it, stayed there for awhile,then they both left. The next evening I went out with some people on a hill overlooking Pickstown, south of Yankten and they recorded 21 orange orbs. I did not know this was going on. I was going to Greenwood to do Honor guard for a ceremony. The recorded orange orbs are on the Star Knowledge website Chief Golden Light Eagle.