1. A system for determining the interruptibility of the driver of a vehicle, comprising: an interface to said vehicle for collecting information about the operation and state of said vehicle; one or more sensors for detecting motion of said driver; one or more sensors for collecting physiological information about said driver; one or more sensors for detecting activities of said driver; one or more sensors for detecting conditions outside of said vehicle; and a processor, in communication said vehicle interface and all of said sensors, said processor running software for performing the functions of: collecting data from all of said sensors and calculating statistical features from said data; calculating derived features from said statistical features; and applying a time-dependent interruptibility classifier as a function of said statistical features, derived features, the state of the driver and road conditions to determination the interruptibility.