COMPOUND AND REVERSE CURVES SUPERELVATION TRANSITION
COMPOUND AND REVERSE CURVES SUPERELVATION TRANSITION
(OP)
Hey All,
this my first time designing a road with superelvation.
for REVERSE curve transition without any tangent between curves i apply a 1/2 L on either side of PRC? is that right
for compound curve i follow highway design manual (figure 202.6 ), but 2/3 eL at BC doesnt make sense to me, because it gonna result in 1.6 % at BC
superelvation for larger radius = 2.4%
superelvation for smaller radius = 3.4%
i would appreciate any thoughts or advice.
thank you


RE: COMPOUND AND REVERSE CURVES SUPERELVATION TRANSITION
RE: COMPOUND AND REVERSE CURVES SUPERELVATION TRANSITION
my question if I use 2/3 eL at BC it gonna result in 1.6 % at BC which is lower than 2%
May be because my super elevation rate is not high thats why it come like that
superelvation for larger radius = 2.4%
superelvation for smaller radius = 3.4%
i dont have option to change curves,. i have to stick with existing road layout
RE: COMPOUND AND REVERSE CURVES SUPERELVATION TRANSITION
Don't forget to check the grade at your PRC. You'll have no cross slope there, so make sure you have some longitudinal grade to move the water.
Also, the run-on and run-out rates are normally the same. It should be a straight line from normal crown to full bank, and your reverse curve transitions won't be the same length on both sides of the PRC because the superelevations are different.
What's your design speed?
My glass has a v/c ratio of 0.5
Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/