Aaaaaah, it doesn't shift "normal", at least when its cold.
When your car is cold, the upshift delay valve delays the 2nd to 3rd gear shift for about 45 seconds, or up until you reach 35 mph.
The purpose in keeping the car in 2nd gear for an extended period of time is to quickly warm up the catalytic converter to reduce smog emissions.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".