running board

noun
a small ledge, step, or footboard, formerly beneath the doors of an automobile, to assist passengers entering or leaving the car.

Origin:
1810–20, in sense “platform from which a large pole boat is poled,” Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
running board
 
n
a footboard along the side of a vehicle, esp an early motorcar

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
But one running board felt loose, as if a bolt was missing.
He hops onto the running board and gets us to the festival an hour later.
It is impossible to have a running board at the center of the roof on a car
  with roof hatches at the center.
Chauffer, officer, tillerman and two members on running board are clearly
  visible.
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