A synchronized-width fluid material spreading system carried by a vehicle carrying a positionable plow, at least a triggering fluid material capable of being applied to a vehicle travel surface and at least one slave fluid material carried on said vehicle capable of being applied to said vehicle travel surface, said system comprising:
- a computer having a database, said computer being connected to said positionable plow and to a Global Positioning System receiver, said computer automatically positioning said plow in response to vehicle position at predetermined locations stored in said database;
- a triggering fluid material application device supported on said vehicle and communicating with said triggering fluid material;
- at least one slave fluid material application device supported on said vehicle communicating with said slave fluid material, and
- a controller coupled to said computer and to said triggering fluid application device and said slave fluid application device, said controller having at least one user actuatable control thereon for turning on said triggering and slave fluid material application devices and automatically controlling a rate of application and width of application of said slave material in response to application of said triggering fluid material on said vehicle travel service.