Erosion on a meandering stream occurs
along the outside of the curve
along the inside of the curve
along the middle of the stream
hard to tell

along the outside of the curve

Explanation:

i'm pretty sure it's spores

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.