Linked from
The 9 pages that link to Speed limit, each with the reason it gives.
SpeedRelated: Road rules set maximum speeds to manage crash risk and traffic conditions.
Road traffic safetyRelated: Speed limits set a direct boundary on crash risk and impact energy.
SpeedometerRelated: Drivers compare the displayed speed with the applicable legal limit.
Kilometres per hourRelated: Many countries state road speed limits in kilometres per hour.
Linear motionRelated: It constrains the rate of position change in road travel.