How to find out the instances of Maxis' T21? (I have a new question)

[WilliamKing]

Recently, I am trying to created a mod of Type 21 on the road.  :)Even I get my own T21 on every tile of the straight road, I can still find I some T21 of Maxis'. My friend told me the reason is that every tile will choose between mine and Maxis' at random. And the solution is try to find out the instances of T21 of Maxis' and get them to my T21. I don't know if he is true of falce. If that is the solution, I want to know how to find out the instances of Type 21 that is made by Maxis; and if that is not true, please tell me the true answer

[MandelSoft]

Finding the Maxis T21s is a tricky one. Fortunately, the USL (Uniform Streetlight Mod) contains all T21s of the Maxis roads and NWM and TuLEPs. If you only need to change the streetlights, just modify those T21s.

[WilliamKing]

 
I really appreciate it. Now I can go on working
BUT when I open the USL straight road file. I find nearly 112 instances. Do I need them all or some of them?

[MandelSoft]

You will probably need all of them (one for each wealth and zone density, both orthagonal and diagonal), but it's mostly a copy-paste job