Can I ask, how did you control exposure for that freeway shot that starts in daylight and ends at night? Did you change exposure settings, or were the carlights enough to keep the exposure even?
The D200 is a tank, still kicking!
The easiest way to do day to night transitions is shoot a daytime plate, leave the camera at the exact same place and wait for night.
Shoot a nighttime plate and in post dissolve them together.
I usually shoot this type of stuff later in the day so i dont have to wait so long for night time.
One thing to remember, DO NOT MOVE THE CAMERA!