[pgrouting-users] routing in linestring trouble

[Andrea Mazzeschi]

Hi! I've got a problem using LINESTRING in my project. 
In my map I've a principal road and some other roads starting perpendicular from this one.
For example:
Main road (0 0, 0 10)
r1(0 2 ,2 2)
r2(0 5, 20 5)
If I try to route from one point of a rod to another belonging to an other road, it doesn't work and I don't understand why.
Can anyone  help me?
(thanks and sorry for my bad english)
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zEuSsE
e.mail: zeusxxl at virgilio.it