the balance btwn likeability and assertiveness

walking from the subway to the office, crossing the street... car that must have raced through the red light coming perpendicular to the crosswalk, blocks the traffic from the other section, parallel tou us. i wanted to shout and force everyone to stop crossing the street and let the car through, but i haven't reached that stage yet. i want to. but i think i have an inherent fear of not being liked. i thinki the key to success in business is to be a liked person, and i have not yet uncovered that fine balance between likeability and assertiveness.