Related Clues:

• It may concern arms or contain legs
• Hot-button topic, often
• Go 50 in a 30-m.p.h. zone, e.g.
• 10K or 50-yard dash
• Track asset
• Go like the dickens
• Word with ''horse'' or ''human''
• Rev at high speed
• Runaway bus film
• Meet heat
• Horse _____
• Horse ____
• It goes to the swiftest
• "Amazing" contest of reality TV
• A long one may have several legs