Max. Gradient Allowed in Roads

Not being a Highway Engineer, I can only offer a general rule of thumb used by Civil Engineers:

Generally, a highway gradient of 8.0% maximum is the upper limit, but I've seen 12% (this is an extreme and rarely used value) used in some instances on the Interstate system and older highways due to very severe topography.

Great explaination and sense of humor!!

h

You may also like the name of this road.

Hardknott Pass

You'll also find the picture there.

plus a 40% incline deemed "Not suitable for motors"

Do you mean along the roadway, or across the roadway?

LOL Great sense of humor!

Ahhhh, but one must remember that in England they let the people own tanks and armored vehicles of all types, and then permit those same bloody owners to run them on the bloody public roads......most tanks and other armored vehicles are well suited to climb 30% road gradients! First time I saw a tank on the public thoroughfare in the UK I was utterly shocked. Peep's weird habits and deep deep pockets seem to be the norm there, eh?

I wonder why Monty Python never did a tank skit, or did I miss that one......?

What country ?

http://www.youtube.com/watch?v=oY1_wEjL0x0

Here's another cute one: http://www.google.com/imgres?imgurl=http://www.visitingdc.com/images/lombard-street-picture.jpg&imgrefurl=http://www.visitingdc.com/san-francisco/lombard-street-picture.asp&h=475&w=600&sz=159&tbnid=mN4HwNuMHNdZRM:&tbnh=107&tbnw=135&prev=/images%3Fq%3Dlombard%2Bstreet&zoom=1&q=lombard+street&hl=en&usg=__PmsmAa4fZSNkLMCQFy6r6YROTTo=&sa=X&ei=zsjNTJzPMZS0sAP_ndD6Dg&sqi=2&ved=0CC4Q9QEwAQ

And another: http://www.youtube.com/watch?v=NYKUk0XVeTQ

wasnt this road used in a film chase ? poss with clint east wood ?

Check out this scenic ride through San Fran.

http://www.youtube.com/watch?v=Z-7IEPTAoTg