Heads Up Display
The digital projection of your instrument data onto the lower portion of your windshield (driver's side). Driver doesn't have to take his eyes off the road to read this instrument panel.

Heavy-duty truck
vehicle weighing from 26,001 to 33,001 lbs. Also included off-highway trucks.

Henry
After Joseph Henry, U.S. (1797-1878). The henry is a unit of electrical inductance.

Hertz
After Heinrich Rudolf Hertz, German (1857-1894). The hertz is a unit of frequency: 1 hertz = 1 cycle per second. Thus, 1 kilocycle and 1 kilohertz both equal 1,000 cycles per second.

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