You and 3 friends are the perfect size for going "charter". If you see an empty Red Plate car, ask him for a fare to take you and your friends anywhere you want to go and negotiate the price. Of course, you can Route Taxi as well but it might be difficult to find one that will fit the 4 of you without the driver wanting to make it a "charter" anyways. Just relax and do it the way you did last time. No reason to be confused if you have already experienced the Route Taxi system.
Peace and Guidance