Incomplete dominance occurs when A. both alleles are expressed equally in the phenotype.
B. both alleles are completely dominant.
C. both alleles are completely recessive.
D. the dominant allele is not entirely dominant.

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.