That's a great question, and it really depends on where you are. In many cities, especially in North America and Europe, you'll definitely find a mix. Yes, a lot of public trash bins, particularly in downtown areas, parks, or near building entrances, do come with those small, metallic ashtray tops or side-mounted trays. They're designed for people to safely extinguish and dispose of their cigarette butts, keeping them off the sidewalk and out of the regular trash where they could be a fire hazard.
However, it's not universal. Some municipalities have removed them to discourage public smoking altogether. In other places, you might see standalone ash urns or specific smoking poles instead of bins with integrated ashtrays. The trend is definitely towards providing designated disposal points to reduce litter. So next time you're out, take a look around – the presence or absence of those ashtray tops tells you a lot about the city's approach to smoking and public cleanliness.