 
the distance of each "step" up is one foot. a couple of little touches I like - make a step down after the top board as shown so the car does not go straight to the ground if you happen to drive too far off the end. Also, the handles help a lot in moving the ramps and carrying them. I used glue and screws.

"Straight-line acceleration is probably the first aspect of automotive performance that any intelligent driver gets bored with." Peter Gregg
"We owe a lot to the dragsters. They always break something, figure out a way to beef up the part and the benefit trickles down." Robo
"Not everything that can be counted counts. Not everything that counts can be counted." Einstein
"And now my friend, the first-a rule of Italian driving, [Franco rips off his rear-view mirror and throws it out of the car] what's-a behind me is not important." Raul Julia, playing Franco Bertollini while driving a Ferrari Daytona in the movie Gumball Rally
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