I live on a busy road, and there is a traffic collision in front of my house every day.
Wow, that is a lot.  Any serious ones?  They can often cause injury, death or property damage
No deaths, thankfully, but the jaws of life were used last month.  The girl who got hit lived.  I don't know why there are so many.
A lot of things could be at fault.  Car design, speed, driver skill, and other things can contribute.  
Since there are so many, I wonder if the traffic collisions are caused by the design of the road.
They can.  Road design and environment are some major causes as well.  Not to mention any driver impairment is a cause too
Oh yes.  The jaws of life accident was a drunk driver who collided into the girl trying to turn left.  
That is sad.  Over 1.4 million people died in car crashes per year as of 2013.  Way too many