There were several minigames where you would drive vehicles around in your city. If you drove a train, you would have to get from one point to another in a certain amount of time. Drive fire trucks to a fire to put it out. Stuff like that.
Emergency vehicles had sirens that you could turn on that caused other cars to drive towards the shoulder and stop so you could pass them, which worked great... except at intersections, which caused cars driving at right angles to your path to dart forward and come to a complete stop, blocking the road. Making the siren totally useless, oops!