Bright green ball of light on highway 167

I was driving back from my girl friends house driving south on highway 167 between Kent and auburn. While driving I just happened to notice that there were no other cars on the highway going north or south except me. There were no lights on the road nor any house lights on either side of 167 because it was mostly farmland and pastures. 
Then all of a sudden I saw this bright green sphere shoot down in my vision.  It was right in front of my truck. I could not tell how far away it was but in my view it seemed to be about the size of a quarter.  It was really bright green, almost fluorescent colored.  Its shape had a band that wrapped around it like a tootsie roll lolly pop. It stayed the same shape as I continued to drive. 
I was going about 60 mph. I quickly looked around to see if there were any type of vehicles or lights coming from the side or anything that could explain this.  But there was nothing remotely similar to this object.  Then as fast as I saw this object it took off into the sky almost straight up in a split second.  I tried to track it but it was too fast. 
After that I started to see vehicles on the highway going north as though there was a break in the regular traffic.  Then vehicles  heading south appeared in my rear view mirror.  It was almost like I was the only one who was allowed to witness this object. 
I never told anybody about this until a few months later. After that I started having dreams of something chasing me. The dreams lasted for several weeks then stopped.  I haven't seen anything like that again or have had dreams of being chased.
Witness indicates that the date of the incident is approximate.  PD