Riding a bicycle at a gallop, you want to go beyond the current predicament, but being blocked by a car represents a stronger psychological motivation, which you have not yet.
The little boy represents your long-neglected sub-personality, who was once full of spirituality and vitality.
The deceased represents the denial and abandonment of the former self, and firecrackers represent celebration. You still don't understand the instructions of fate. You are scared away. At this moment, two "horses" are running towards you. They are powerful life impulses lurking in your heart. They lurk because you never realize them. Now the subconscious mind releases them through dreams, and you can control them easily.
The last dream is the dream car of personality integration, that is, the people in your own car represent your personality many times. They can represent the obstacles in your spiritual growth together. You climbed up effortlessly, which shows that your mind has got rid of the rigid predicament.