Here are some samples of photos that I took during the week using long shutterspeed. For landscape photos you need a tripod, to be independent from any lightsituation. The long shutterspeed allows you to show movement of water, clouds, carlights in contrast to static structures like the rocks in the water. The evening time after sunset is a good time to practise long shutterspeed. It is important to know that most cameras have a limit of the longest shutterspeed of 30 seconds. If you need a longer shutterspeed use the B-setting on your camera and a cable release.
p.s. the photo inside the car was taken as a passenger not as a driver, thanks Franz for the chance to try this.