Where on I80? Last I checked it goes from SF to NY. Granted your location is Fairfield, but even sticking with CA, I80 is about 200 miles of roadway. I know someone that owns a 2001 or 2002 NSX coupe w/black roof that could have been on I80, although his normal daily commute probably only uses a small section of US50. Was your siteing in Fairfield?