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• Development of Human Factors Guidelines for Advanced Traveler Information Systems and Commercial Vehicle Operations: Comparable Systems Analysis

Development of Human Factors Guidelines for Advanced Traveler Information Systems and Commercial Vehicle Operations: Comparable Systems Analysis

User Input (Controls)

Driver input to the TravTek system is provided through three sets of controls. The TravTek functions are activated by a push button located adjacent and to the right of the CRT display. The push button is labeled "NAVIG" and was originally designed to activate the compass in the Oldsmobile Toronado. As described above, steering wheel buttons were also provided to access selected controls while the vehicle was in motion. Eight functions are available:

1. HOP LEFT allows correction of current vehicle location on the map.

2. HOP RIGHT also allows correction of current vehicle location on the map.

3. O.K. NEW ROUTE lets the driver accept a new route determined by the system to be faster.

4. WHERE AM I? provides current location and heading information.

5. TRAFFIC REPORT provides a report on current relevant traffic conditions.

6. VOICE GUIDE provides voice guidance information.

7. REPEAT VOICE replays the last voice message as long as it has relevance.

8. SWAP MAP allows the driver to switch between the guidance screens and the moving map displays.

In addition to the "hard" push buttons, a 25–key touchscreen overlay is an integral part of the CRT display. This touchscreen is described in detail in the Visual Information Display section above.