Hi everyone..I am a newbie to game programming and game AI, and currently working on a Public Bus Simulation project. After doing some analysis,I realise that the main classes of my simulation system would be Bus, Bus Stop, Road, Intersection and Traffic Light. My question is how should I design those classes. For instance,for Road class, what should I include besides the 3D points of the road? For every game loop, each Bus should check if there is any obstacle or vehicle ahead before it updates its position in order to avoid collision. So how can Bus get information about obstacles on the road? Should I store those information inside the Road class itself? This is my final year project and I am totally lost right now coz I am new to graphic and game programming though I do have some programming experiences in C++ and Java. Help and suggestions are really appreciated. Thanks .