well, something like this?
lets say the road is a matrix stretched over 2 points, (100, 100) & (150, 400). the road width is 50 and road length is 300
CarObjNum = 100
StartNum = 101
NumberOfCars = 20
load object "car.x", CarObjNum
for id = StartNum to NumberOfCars+StartNum
clone object id, CarObjNum
LeftOrRight = rnd(1)
if LeftOrRight = 1 then X = 120 : else : X = 140
position object id, X, 0, rnd(300)+100
next id
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