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one in three hill

6

69Boss302

Has mile high skills
Joined
Dec 26, 2001
Messages
2,630
Location
St.George, SC
Saw it recently on Top Gear and heard it elsewhere. I know it's a steep hill but what are the differences between a 1 in(and maybe?) 2 and 1 in 3 hill?
 
1 in 3 refers to the gradient of an incline / slope etc.
for every 3 feet travelled the incline rises (or falls depending which way you are travelling) 1 foot which appears as 1 : 3 with a triangle on our road signs.

sometimes the road signs are shown as a percentage here in the uk.
for example a 1 in 4 gradient = a 25% gradient

gradient.gif
 
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You know what, now that you mention the 25% thing, it was in the Iowa driver's license study book.

If a hill's grade is shown on a sign in the US, it's always a percent as far as I know.

For example, I was trying to climb a 6% grade (1:17 I suppose) over the NA Continental Divide with W-rated summer tires on packed snow at 7500ft.

...Yeah, I didn't make it! :blackeye: Had to be pulled over the top by a US Government Forest Ranger vehicle. Brakes were not so effective on the other side, and realized the ABS system goes haywire if all you do is spin the tires constantly!
 
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