The manual says that the temp guage may sometimes go to the very left edge of the red zone. It also says that this is not something to be worried about. Sitting still makes the car warm up because there is no airflow past the engine. Don't worry unless it gets in the red.
<span style='font-size:8pt;line-height:100%'><span style='color:blue'>1998 BMW 323is Coupe, Black
18" M3 Hyper Silver Rims
2 12" Rockford Fosgate Subs; Sealed
1.0 Farad Capacitor
800 Watt 2-Way Rockford Fosgate Amplifier</span></span>