The tough part is getting folks to understand the difference between hard core type fill and biodegradable and bio hazardous trash.
Although I hate the fact that plastics and construction debris are thrown in the holes, it does eventually create a useable road once it has been crushed and sand thrown on top. No this is not an ideal situation but if it is the situation we have to deal with it would be beneficial to try and help people to learn and understand the differences in their refuse.
In most cases the US, Canada and European nations are already required to separate their trash so it is shocking to realize that other nations haven't followed suit yet.
First attempt to separate some trash have been made in the past and the "plastics", "paper", and "glass" bins always ended up with household kitchen and bathroom refuse.
Change is going to take a couple of generations. All literature, lectures and signage would need to be in English and Spanish - and the cost of such an educational project will be high. Not impossible but certainly a big challenge.