Super elevation transition regions issues

[Anonymous]

Hi,

Am having problems achieving minimum superelevation run off length. The minimum required is 56m (see manual excerpt in the first attachment). I've circled the column for the circular curve radii and also my design speed column (100 Km/h). My run off after calculating the superelevation is about 28 m (20.6 + 7.4)m-see second attachment. I thought i had set everything right in the design criteria editor and i'm using AASHTO metric 8% max superelevation table because it's similar to the manual am using. How do I get the required run off length in my design? Your help will be highly appreciated.

Another quick querry, if u look at the 2500m radius, the superelevation rate is 2.1% for 100Km/h design speed and my normal crossfall is 2.5%. Could that be an error in the manual?  How can the superelevation be less than the normal crossfall. I tried changing it to at least RC or 2.5% in the design criteria file but it remains at 2.1 in all 2500m radius curves after recalculation. What could be the problem?

Thanks in advance.

[HorizontalCurveGuy]

You can enter the Tabular Editor and adjust the length

[Anonymous]

Thanks, but i anted to edit it in the design criteria file and recalculate superelevation for all the curves at once