You have probably been active in your community trying to enact legislation and get people involved in causes. This is one possibility for a reason that you would be dreaming of a bus. If you haven‚Äôt been getting involved in the community at large then perhaps you have just become more involved with your more localized community within your life such as your main group of friends. Are you making an active attempt to be friendlier and more accepting of those around you? It will probably show.
However, to dream of a bus accident suggests that what you have been doing has not been working. Despite your best efforts, your advances are being rejected. You have been trying to foster a sense of community with those around you or you have been trying to insert yourself in the lives and communities of others, but it has simply not been working. To see the bus crashing, this means that the whole community is being brought down with it.
It is possible that it is your fault that the bus is being brought down. Maybe the people around you that you have been trying to help were better off without you and you are just making things worse now. Perhaps your attempt at being more friendly or making friends with those around you has caused all of those people that you were friends with to lose their friendship with each other. You have created an interruption or distortion in the equilibrium and it is causing you to bring down the entire group. You might want to take this opportunity to bow out before you cause too much damage.
Another meaning that is possible for a dream in which you see a bus crashing is that you see some kind of horrible tragedy happening soon. A car crash is a big deal, but for two cars crashing into each other, even if every car was back to the brim and everyone died would kill maybe ten people at maximum. A bus packed to the brim can hold fifty people or even more on some occasions depending on how many people the bus driver is willing to let in. To see all of these people dying in the crash could mean a significant worse tragedy or interruption than anything that could come from a normal car crash. Try to avoid doing anything that you know is dangerous and try to avoid making any controversial decisions for a while until you feel like you are in the clear. This is how it will work in the end and it will make it easier on you to accept. You cannot save everyone in situations like this so you must focus on saving yourself.