Eben Green, the Tankville constable, was a deadly enemy of the over-speeder. The local limit was ten miles an hour and Eben, brave man, held all and sundry to the strict limit of the law. The result was that he was constantly getting himself in "Dutch" with his good friends. Eben seeks repose from his labors by the wayside and falls asleep and he dreams a dream. He and his help endeavor to stop an automobile driven by a local judge, but the judge evades the obstacle, placed across the road, and in evading it, meets with an accident. On recovery from this accident he has poor Eben arrested for attempted murder, and he is condemned to thirty years hard labor. His troubles as a convict are terrible to follow, but finally he escapes from his prison by scaling its walls, after the guards have unsuccessfully attempted to electrocute him. The convict constable, of course, coalesces with the real constable in the picture, and when Eben awakes and comes to his senses, he changes the Tankville sign from ten miles an hour to 100 miles an hour. By this means he relieves himself of further trouble by "over-speeders."
—Moving Picture World synopsis