What Does Length Refer To On A Vertical Profile?

Hi all

 

I was hoping someone could explain what BRT refers to when it comes to length of gradients on a vertical alignment.

 

I have a horizontal alignment which I have designed and stationed.

 

I have created a profile but kept the horizontal and vertical exaggeration as 1 and 1 so I am displaying all my vertical profiles in 1 to 1 scale.

 

I have created two gradients to start my vertical alignment.

 

The first gradient is 1:26.

 

The second gradient is 1:-2.

 

Focusing on just the second gradient line.

 

I have always believed that the length of the gradient line is the true length measured along the slope of the gradient line.

 

So in this case the true length of the second gradient is 2.1133104.

 

But when I select Check Vertical Integrity, the length of the gradient line is shown as 1.957, this length is actually the length of the projection along the axis and not the true length measured long the gradient line. Is this correct??

 

Also when I run a report on the design geometry I see that the second gradient has a tangent length of 1.957 but this is the distance of the gradient line measured long the x axis and not the length measured along the slope of the gradient line? why does BRT describe length this way and is this the default for all gradients including vertical curves?

 

Below is a screen shot on my vertical profile.

 

Can someone shed any light?

 

Thanks.


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