Transition Between Compound Curves

Hi,

I am using MX Road V8i, SS2. I had problem when I am doing Horizontal alignment Design using Menu - Design/Alignment.

I was trying to apply transition between Compound Curves (R1=1000,L1=172.972; R2=500,L2=80.947). Its Like CURVE1-START TRANSITION -CURVE2-END TRANSIION. No Transition for Curve1

When I apply transition of 50m, for Start Transition Its is taking only 25m with a warning message “Compound Curve – RL Value amended to that for Smaller radius”. End Transition was taken correctly as 50m.

I can get 50m Transition length, only if I gave 100m Transition length for Start Transition.

I found that, MX is re-calculating Start Transition as (R2/R1 * Transition Length : (500/1000)*50=25).

Why it is like this in MXRoad? Is there any technical reason behind it?

 

Regards

Anil