83
[Terms and curves to be used in Road Calculation]
BP Beginning point
of route IP
Intersection
point of main
tangent
EP End point of
route
IA Intersection
point of main
contact
BC Beginning of
curve
CL Curve length
EC End of curve SP Secant point
KA Beginning of
clothoid curve
KE End of clothoid
curve
12.1 BP, IP, EP input
Press [F2][ROAD] in PowerTopoLite to open
BP DATA SETUP.
Press [ENT] to open the PN,X,Y,Z and PC input window
and input each.
Then, press [ENT] or [F5][ACCEPT] to view the IP DATA
SETUP screen.
NOTE:
Based on the input parameters in the following table, basic design clothoid, raised type clothoid
and simple curve are calculated.
Type Input items
Basic design
clothoid
Radius R
Parameter A1, A2
Raised type
clothoid
Parameter A1,A2
Simple curve Radius R
You can input radius R, parameter A1,A2 in the range of 1m or more and less than 10,000m . If you
input only parameter A1, or only parameter A2, a message 「clothoid<--->arc cannot cal.」 is
displayed. This doesn’t support road design composed from clothoid-simple curve or simple
BP EP
BC1
SP1
EC1
KA2-1
KE2-12
IP1
IP2
IP3
KA2-2
KA3-1
KE3-1
SP3
KE3-2
KA3-2
Curve
Curve
1
Curve
3