10
Design Elements
General Guide to RoadPlus - 4.0.0en
station
E
1
, N
1
station
E
2
, N
2
R=
∞
R
1
=
∞
parameter A
station E
1
, N
1
station E
2
, N
2
R
2
= n
station E
1
, N
1
station E
2
, N
2
R
2
=
∞
R
1
=n
parameter A
For the reason of completness, a short summary of the
design elements for horizontal alignment is included in this
chapter.
The Tangent
- straight line between two points. It's end point
is identical with the beginning of a curve or spiral. The tangent
is perpendicular to the radius of the curve.
The Curve
- circular curve with constant radius.
Sipral in
- spiral transition from tangent to curve.
Sipral out
- spiral transition from curve to tangent.
station E
1
, N
1
station E
2
, N
2
R