Superelevation of a Curve Question

[4237ft]

I am confused about the application of a curve with a negative superelevation. Where is this used? Does a negative superelevation mean that the cross-slope is sloping down toward the outside of the curve?

To give a little more background. I was working a problem with a -4% superelevation, and when I looked at Table 3-13b - Minimum Radii and Superelevation for Low-Speed Urban Streets in the 2011 Green Book (Exhibit 3-16 in the 2004 Ed.), I didn't even see the negative values for "e" because my eyes went to the middle of the table and I found the radius for a curve with a super. of 4%, which gave me the wrong answer. So I guess I'm a little confused on the sign notation and application of a curve with a negative super.

Thanks!

 

[JMT]

I believe page 3-53 of the 2011 GDHS explains negative superelevation. Along with the tables following it.

 

[ptatohed]

you're both right. se is positive when the outer edge of pavement (ep) is higher than the inner ep along a curve and negative when the outer ep is lower than the inner ep.

 

[4237ft]

I believe page 3-53 of the 2011 GDHS explains negative superelevation. Along with the tables following it.

Thanks, that's what I was looking for.