Driver alerting system used to alert operator of vehicle such as loss of attention due to use of a cellular telephone has telephone call detection section and running condition judging section to detect that vehicle may be unstable

摘要

An alerting section alerts a vehicle operator when, based on a result from a telephone call detection section (5) and a result from a running condition judging section (6), that vehicle operator is using the portable communication terminal or the vehicle operator is expected to use the portable communication terminal and the driving of the vehicle is unstable or expected to become unstable.