Why do people honk on roads?

I travel around 40 kms a day and daily I start my car saying that I shouldn't honk at all but at the least I do it like 4 to 5 times in a day. I then started noticing the situations where my hands starts itching to honk. I mainly do it when the vehicle before me starts moving left or right without noticing who is behind. I then started noticing these vehicles and mostly this happens with vehicles that doesn't use rear view mirrors. So the persons inside these vehicles have no clue on what's going on behind them, they have no clue if they are blocking some one by going in the middle. When they want to shift lanes, they just start moving slowly towards right or left until some one honks and then they stop if they hear the honk. They have no complete control on the road, all they know is what's in front of them.
Now coming to work, are you the one who doesn't use rear view mirrors and so don't know what's going on around. Do you just do your work and doesn't look at anything else? If so aren't you working blindly, same as driving blindly. You don't know how other team members are performing or how you can outperform them. All you do is look straight and follow someone, doing everything in an orthodox manner.
Always be in control of your work. Look at your team mates, look at other groups, look at other companies and see how you can outperform all of them. Apart from your work and from all your research and innovation, also look around and explore new things, see how others are doing and try to beat them in their own court. If someone is highly regarded as good in testing, look at his/her bugs and see how they are doing and try to beat them in their strong fields.