Vehicle plows into crowd on Bourbon St., with 14 fatalities

As for maintenance on the retractable bollards...the problem is things getting stuck down in the gap, like Mardi Gras beads and various other things, am I correct? If that is a problem, why can't they just add a cap to them with a flange that fans out a few inches? Basically just a protection measure, and it would add a slight bump, like a speed strip when retracted. I've seen this in other places.
Nobody has really said why they needed maintenance. Just that they were doing maintenance on them in preparation for the Super Bowl. Being maintenance, I assume it was to make sure they properly functioned during the Super Bowl, not a situation where stuff was stuck in them and they needed to be repaired. But, I don't really know.

It's been awhile since I looked at them, and I never really took a very close look obviously, but my recollection is that there isn't much of a gap where stuff could fall in and get stuck.