Yes, in most cases, folding bikes are allowed on buses. According to my search results, folded bikes are widely accepted on domestic bus services around the world (source: [Bike Push](https://bikepush.com/folding-bike-commute/)). However, there may be instances where you’re not allowed to travel if the folded bike blocks an aisle or seat access and there is no luggage space. Most bus systems allow up to two bikes to be carried on the front of the bus, and bicycles are not allowed inside buses or vans, except folding bikes (source: [Intercity Transit](https://www.intercitytransit.com/how-to-ride/bikes-on-buses)). Some systems, like the MTA in New York City, allow folding bikes almost anywhere, except on express buses (source: [MTA](https://new.mta.info/guides/bikes)). Omnitrans in Southern California also allows folded bikes on board but must be kept out of the aisle (source: [Omnitrans](https://omnitrans.org/ride-guide/how-to-ride/)).
Folding bikes are allowed on almost everywhere as they are designed to be hand-carried. But are folding electric bikes allowed on buses?
No, folding bikes are not allowed on busses. You can’t bring your bike with you on a bus but there are a few buses that has bike rackes where you can secure your bike and bring it with you on your commute.
Although folding electric bikes are not allowed on buses, it is allowed on the subway. Just make sure that you are standing either near or at the end of the subway car.