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This is a Ditloid. The answer is, 70 = National Speed Limit on a Dual Carriageway.
"The maximum speed limit on the freeway is 70mph."
The maximum speed that a vessel will achieve relative to ground is its own maximum speed through water plus the speed of the the moving water downstream.
It usually is, as in maximum speed or maximum occupancy. But it can be a noun, meaning a maximum value or number, as in math or astronomy (the solar maximum).
Visibility does not depend on speed.