closing speed

English

Noun

closing speed (plural closing speeds)

  1. The speed of a moving object relative to another object which it is approaching.
    If two vehicles, both travelling at 70 mph (miles per hour), collide head-on, their closing speed is 140 mph.
    • 2021 February 24, Greg Morse, “Great Heck: a tragic chain of events”, in RAIL, number 925, page 39:
      This secondary collision, head-on with a closing speed of 142mph, caused the DVT to veer off to the left. Many of the coaches behind it overturned and careered into an adjacent field.
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