That's an interesting observation! In my city, I've seen a mix. Some of the newer or more centrally located trash bins, especially in business districts or near public seating areas, do come with those small, circular ashtrays built into the top. They're usually a metal dish, sometimes with a sand-like base, fixed right next to the main opening for general waste.
The idea is clear: to provide a designated spot for cigarette butts, hoping to prevent people from just tossing them on the ground or stuffing them into the regular bin where they could be a fire risk. It's a small feature aimed at reducing litter and encouraging responsible disposal.
However, they're definitely not on every single bin. Older models or bins in quieter residential streets often lack them. Their presence seems to depend on the city's budget, the specific area's foot traffic, and local policies on public smoking. Also, even when they are there, they're not always maintained perfectly—sometimes they get full or the sand is gone.
So, to answer your question, yes, some do, but it's not a universal standard. It's one of those small details in urban furniture that varies greatly from one city block to the next. Have you noticed them being common in your area?