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Having worked with traffic paint maybe I can shed some light on the subject.
The paint already contains pulverized glass, that's what makes it reflective. Adding sand would make it very difficult to put through a sprayer. The costs would go up more than you think. The equipment used for painting lines would not handle sand added to the paint. So it would all have to be replaced in order to spray sanded paint.
The other option would be to add the sand after the paint is sprayed. This means trucking it in, cleaning up the excess. As well as the diminished reflective effect which would mean adding more glass to the paint again costing more money.
The bottom line is that the benefits do not outweigh the expense.
The paint already contains pulverized glass, that's what makes it reflective. Adding sand would make it very difficult to put through a sprayer. The costs would go up more than you think. The equipment used for painting lines would not handle sand added to the paint. So it would all have to be replaced in order to spray sanded paint.
The other option would be to add the sand after the paint is sprayed. This means trucking it in, cleaning up the excess. As well as the diminished reflective effect which would mean adding more glass to the paint again costing more money.
The bottom line is that the benefits do not outweigh the expense.
