You need to do a number of things to get a normally static scenery item, such as a bus, to appear as traffic on the roads.
1. The scenery item must have its config.txt file edited to change its category-class from "Buildings and structures" (or whatever it currently is) to "Vehicles Land"
category-class "VL"
2. I don't know which config.txt file you added its kuid number to but it would normally be added to the regional asset kuid config.txt you are using - this is identified in the Edit Route menu selection in Surveyor. Identify the region in Surveyor, then use CM to open that regions config.txt file for editing and add the kuid number for your new vehicle (twice). For example, the current list may show:
car0 <kuid:329364:1568>
car1 <kuid:309161:100599>
car2 <kuid:83500:100105>
car3 <kuid:329364:1553>
car4 <kuid:329364:1570>
car5 <kuid:83500:100056>
car6 <kuid:329364:1567>
car7 <kuid:83500:100115>
car8 <kuid:83500:100102>
car9 <kuid:329364:1569>
car10 <kuid:329364:1555>
... and again in a kuid table usually further down
kuid-table
{
0 <kuid:329364:1568>
1 <kuid:309161:100599>
2 <kuid:83500:100105>
3 <kuid:329364:1553>
4 <kuid:329364:1570>
5 <kuid:83500:100056>
6 <kuid:329364:1567>
7 <kuid:83500:100115>
8 <kuid:83500:100102>
9 <kuid:329364:1569>
10 <kuid:329364:1555>
}
add your new vehicle (with the same car number - e.g. "11" in the lists above). There may be a few other tweaks that you could have to do.
Of course: do all of this on cloned assets so if it gets stuffed up, you can quickly recover.
Try it and see - unfortunately I cannot guarantee success.