What is the maximum number of forward gear ratios that have been used in highway heavy-duty truck transmissions?

A) 10
B) 13
C) 15
D) 20

Gear Ratios

The ratios of the gear teeth counts between interconnected gears in a transmission, determining how much torque is applied.

Highway

A main road, especially one connecting major towns or cities, designed for faster traffic.

Heavy-duty

Refers to vehicles, machinery, or equipment designed for strenuous tasks or to withstand harsh conditions, often with enhanced durability and performance capabilities.