Ticketing was highest on Wednesdays — perhaps due to street cleanings, Rice said — and the most tickets were issued at 11 a.m. of any time of day, the study said. The fewest were doled out at 5 a.m., with a large spike at 8 a.m., when meter enforecement officers begin their rounds. Sundays, when some meters don't operate, had the fewest tickets of any day of the week, the study said.