That's a great and very specific question! It really depends on the city and its local policies. In many places, especially in North America and parts of Europe, you'll find that traditional standalone public ashtrays have become much less common. Instead, a growing number of municipalities are integrating ashtrays directly into the top of their street trash or litter bins.
The main idea behind this design is "convenience meets cleanliness." By providing a designated, safe spot for cigarette disposal right on top of a bin, cities hope to discourage smokers from flicking butts onto the sidewalk or street. Cigarette filters are made of a plastic called cellulose acetate and can take over a decade to decompose, so they are a major source of microplastic pollution and street litter.
You'll most often see these combo units in high-traffic urban areas like downtown cores, outside office buildings, near public transit stops, and in entertainment districts. The ashtray part is usually a simple, recessed metal or heat-resistant plastic panel with sand or a small grate. It's not glamorous, but it serves the purpose.
So, to directly answer your question: yes, many modern urban trash cans do have ashtrays built into the top. It's a practical solution aimed at keeping our sidewalks cleaner and reducing fire risk. If you're a smoker, keep an eye out for them—they're there to help!