Bus
A bus is a road travelled with others, so it mirrors life among people. Sitting comfortably means finding your own place within an organization, and getting off at the stop you wanted means things running to plan. Missing the bus, by contrast, signals a call to look at the flow again, and boarding one heading the wrong way is the scene that asks whether the road you are on is the one you chose.
On a bus you do not pick the route, and it halts only where it has been set to halt. Tradition had no such symbol, but the modern reading takes it as your seat within a group or an organisation. Whether you boarded or missed it is the dividing line.
Readings by Situation
Riding comfortably in a seat
A good sign that you are where you belong. Read it as doing your part within the group. A good view out the window reads more strongly still.
Missing the bus
A sign that you feel pushed out of the flow. It is not a forecast of actually losing an opportunity. Reading it as another bus coming is fair enough.
Boarding the wrong bus
This reflects asking whether the road you are on is really yours. It comes up when your path or your belonging is in question. Note that getting off is also possible.
Standing on a packed bus
A sign that the space feels tight. Read it as a time of hard competition. If it was exhausting, look at whether your actual schedule is too heavy.
A bus dream does not forecast a real journey or accident. It is a scene drawn by how you feel about your place among others. Missing it does not mean the chance is gone.