This pertains to the state of MA. So this morning I stopped behind a school bus that was pulling over to the side with the red-yellow lights flashing, since it's instinctively the right thing to do. However, the "Stop" sign arm on the bus was not extended for quite a while, but this car behind me was honking at meso I proceeded to pass out of panic and pressure thinking that I was not supposed to stop. As I passed, I heard what I thought was the school bus honking at me, however, I saw that a few other cars followed me to proceed as well. I was just entirely confused after that...is it lawful to pass a school bus even though the stop sign arm was not extended? and if it's not, why did I get honked at by the car behind me when I did stop?
Thanks!

