B. road users
(Explanation: "Road users" refers to people using the road, which includes drivers, pedestrians, cyclists, etc.)

A. signal
(Explanation: "Signal" is used in the context of indicating a turn or lane change, typically with the car's lights or hand signals.)

C. obey
(Explanation: "Obey the rules" is the correct phrase to describe following laws or guidelines.)

D. from
(Explanation: "From" is used to describe the distance between two points, in this case, from the house to the bus stop.)

D. by bus
(Explanation: "By bus" is the correct phrase for traveling on a bus.)