Problem working out measures on LRS segment

Hi,
I'm working on an app to work out waiting times of conmuters at bus stops. I chose the approach of using measures to assign times in stops from the start of the line, e.g.
STOP1 is (x1,y1,0)
STOP2 is (x2,y2,17)
etc
The stops are the points defining LRS line string with geodetic coordinates.
It works fine projecting points (buses' positions) on the line string which gives me the measure of all buses and from it I can calculate the min time to a stop among all buses.
The problem is, some of the routes are not simple line like 1----2------------3-------4, but they have sections where the bus leaves the motorway at an exit, runs down a road to a stop, and comes back to the motorway up the same road to the same exit, something like (dots are countryside ;-)):
1----------2-------------3-------------5
...........................|...............
...........................|...............
..........................4...............
When I try to project a point between 3 and 4, Oracle gives wrong results (measures that correspond to the 1-2 segment).
Is my approach wrong?. Is there a way to deal with this go-and-return using the same road issue?.
Thank you.

Hi,thanks for the message yes will post pic later today! cheers

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Problem working out measures on LRS segment

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