制せい限げん速そく度ど

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Meanings

1

noun

Refers to the legally mandated maximum speed on a road. Often used in traffic contexts.

system, law, rule

限limit, restrict, to best of ability

速quick, fast

度degrees, occurrence, time

法ほう定てい速そく度ど
法定速度 refers to the statutory speed limit set by law, while 制限速度 is a more general term for any imposed speed restriction, including those set by signs.

Compound of 制限 (restriction) and 速度 (speed).