I don't think this is a problem with the trucks not picking it up in time... I now have 16 trucks, no visual indicators of uncollected garbage in the waste management information screen, but my trucks are only collecting 1023 of 2009 cans...
I'm noticing the same issue with my recycling centers.. I have 3 total with 48 trucks in all, but those 3 facilities and the fleet of trucks only manages to collect 11,613 out of 23,473 bins per day.. I also think that the material storage for the recycling centers in seriously undersized.
Personally I think that they shouldn't have set a "work day" for these services, these services should run until no longer needed for the day, regardless of how long it takes to collect.