Definitions from Wiktionary (design speed)

▸ noun:  Of a transport system (such as a road or railway), the assumed vehicle speed used in calculations when designing the system; typically the fastest speed at which it is deemed safe to use the system.
▸ noun:  Of something that moves (such as a vehicle or motor), the optimal speed as endorsed by its designers; typically in terms of some balance of various factors that are relevant to the object's purpose, such as longevity, efficiency and velocity.


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