Some people do know most road laws and follow them but some don't know them that good and it's different in almost every country. I follow the law most of the time but from time to time it is just easier and more efficient to go a little faster, of course, we all should respect each other and be helpful to get traffic to move as smoothly as possible.
I believe that some of those that do 110km/h are just people that need to get to a place fast or just want the challenge.
I believe that those that try to crash and destroy for others are people either bored and doing it on purpose for some unknown reason different to everyone. But also we all make mistakes and most learn from then.
Of course, if they break any of these Rules you can always report them either in-game or on the web with evidence Here
I believe most people don't know but an increase in speed no matter how much increases the time it would take you to stop by huge numbers.
Let's take an example, you are driving a car at 90km/h and something appears about 45 meters in front of you blocking the road, the road conditions and tire conditions are perfect, you will be able to reduce your speed to 70km/h before you crash if you have a good reaction time.
Now if you are driving a car at 110km/h and something appears about 45 meters in front of you blocking the road, the road conditions and tire conditions are perfect, you will be able to reduce your speed to 100km/h before you crash if you have a good reaction time.
Now, this is no exact calculation but somewhat with a reaction time of around 1 second.
When you double (x1) your speed, for example, 50km/h to 100km/h the distance it takes to react and stop increase by x4 times
This is if you are driving a car (IRL). Just imagine the effect it has with a fully loaded truck and trailer pushing you forward.