I am fortunate(1) in that I travel against the prevailing flow of traffic during morning and afternoon rush.
DART (Dumb *expletive deleted*ss Road Tyrants Dallas Area Rapid Transit), in its wisdom, actually enforces the HOV lane rules once in a while by:
1. Parking DART cop cars, lights a-flashing in the HOV lane.
2. Stopping EVERY auto in the HOV lane to make sure 2+ humans are in it.
3. Ticketing those who don't have 2+ folks.
What is the effect of this? To bring the already very heavy (in this case, southbound) rush traffic from, say, a "trot" to a crawl.
HOV lanes are an idiot's idea in the first place. It takes a special kind of idiot to actually enforce them.
(1) Our designs and the thumb of the Good Lord were on our side, however, as we actively sought housing that would minimize our commute(s).