Finding 5-11. In general, intelligent vehicle technologies provide fuel consumption reductions by taking advantage of knowledge of the vehicle’s location, terrain in the vicinity of the vehicle, congestion, location of leading vehicles, historical traffic data, and so forth, and altering the speed of the vehicle, the route the vehicle travels, or, in the case of hybrid electric vehicles, altering the power split ratio. This fuel savings may not show up in any fuel consumption test.

Finding 5-12. A number of the technologies—adaptive cruise control, predictive cruise control, and navigation and route optimization—are being applied by the trucking industry without any regulation because the owners and operators view the reduction in fuel costs as good business.

Finding 5-13. Based on experiments to date, the electronic tow bar concept of trucks traveling closely spaced in tandem can provide significantly lower fuel consumption, 8 percent to 15 percent, compared with the same vehicles traveling separately.

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