First type of route you have driven

[mvak36]

2di: 80
3di: 680
2dus: 6
3dus: 275
SR: NE 64

[Darkchylde]

Interstate: I-12
US Highway: US 190 (First 2dus: US 11)
State Highway: LA 1088
Parish Road: (Former) St. Tammany Parish Road 24

[Doctor Whom]

Interstate: 495 in Maryland
US: 1
State: Md. 355
Route signed with a county route number: CR 571, Mercer County, NJ
Any roadway maintained by a county: the street where I grew up

[DeaconG]

Wow, I really had to dig for at least one of these categories:

Interstate: I-95 (from Fayetteville NC to Philadelphia)
US Route: US 1 (City Avenue)
State Route: I would have said PA 23 (Belmont Avenue) but that was when the route terminated at Lancaster Avenue so i'll go with PA 3 (West Chester Pike, Chestnut and Walnut Streets)
County Route: CR 165A in Jackson County, FL