How to enter path and part number in a script

[soulbody]

i want to let something happend at a part on a path.

we people who not usually use the editor:

you can make paths and ''streets'' to let vehicles drive, each point you assign get a number.

i want to make a script where something happend when a vehicles get over that number.

for i the person who can tell me how to make this (i only need the part like if vehicle reach point 1 of path 3.

place take those vaulue for example

Path = dummy

Point = 53