Abstract: A first calculation unit calculates a moving average (dose rate) using a relatively long averaging period (T). A second calculation unit calculates an integrated value (dose rate) using a relatively short time constant (?). In a state in which the moving average is displayed, an alarm determination unit identifies a dose abnormality on the basis of the integrated value. Within a measurement start period, a display switching determination unit identifies a constant dose rate state on the basis of the integrated value. A restoration determination unit identifies the restoration of a dose rate on the basis of the integrated value. If a dose rate is displayed using a large degree of smoothing, sudden increases, and the like, in the dose rate can be identified quickly.

Abstract: An engine start control unit enables engine start when a user performs a predetermined normal time push operation on a push switch in a normal mode. The engine start control unit enables the engine start when the user performs a predetermined fail-safe push operation on the push switch in a fail-safe mode. The fail-safe push operation of the push switch requires an increased work load of the user in comparison to that of the normal time push operation of the push switch.

Abstract: An engine start control unit enables engine start when a user performs a predetermined normal time push operation on a push switch in a normal mode. The engine start control unit enables the engine start when the user performs a predetermined fail-safe push operation on the push switch in a fail-safe mode. The fail-safe push operation of the push switch requires an increased work load of the user in comparison to that of the normal time push operation of the push switch.

Abstract: Engine-racing control is performed in which a throttle valve is temporarily driven to the open side at start of cruise control. The engine-racing control is forcibly stopped when skip vehicle speed Vsk serving as an estimated vehicle speed after a predetermined time becomes higher than storage vehicle speed (target traveling speed) Vm. For example, on a downward slope where a vehicle is naturally accelerated due to gravitational acceleration, the vehicle is excessively accelerated due to the engine-racing control same as that on a flat road. However, because the behavior of the vehicle on the downward slope is reflected on the skip vehicle speed Vsk, it is possible to stop the engine-racing control early compared to the case in which the vehicle travels on the flat road and to avoid excessive acceleration.