A parade of ... Taxis?

I've seen many a strange thing pass down Blanco Encalada, the street in front of our department, including student protests, several funeral processions, thousands of buses, cars, converted delivery bicycles, and the like. Just now I witnessed 20 taxis moving slowly down the middle lane, honking their horns and covered in white writing, signs, & yellow and black balloons. One of them said "Viva el Transantiago", which is curious because transantiago (the transportation reforms that were implemented 2 yrs ago here to standardize bus routes & convert to card-payments in the metro) is normally vilified. But again what do I know, a gringo in Santiago?! Haha.