BMW’s appropriately named Driving Assistant Professional’ accurately portrays system functionality. The promotional material and the handbook correctly indicate the limitations of the system capabilities. System status information is clearly displayed in the driver’s direct line of sight by a head-up display. The i5 monitors that the driver’s hands are on the steering wheel. The car’s direct driver monitoring system is used only to ensure the driver is not incapacitated. The system balances driver steering input with lane guidance, promoting co-operative driving.

The i5 combines map-based speed limit information with real time camera inputs to manage fixed, variable and temporary speed limit signs. However, the system does not adapt speed for upcoming road features such as curves and junctions. The car responds to avoid or mitigate a collision in all of the test scenarios for automatic cruise control. The driver is supported through the S-Bend, staying within the lane at all test speeds. The BMW has a lane change assist feature. In the case of an unresponsive driver, the i5 performs a controlled stop within its lane. If the radar or camera is blocked the i5 provides a timely warning and prevents system activation.

The i5 from BMW balances a high level of Vehicle Assistance with a similar level of Driver Engagement. Combined with excellent safety back-up, the system, overall, offers Very Good highway assistance.