The fraction of the vehicles that are not cars or motorcycles is 3/8.
Let's say that there are N vehicles on the road. 1/2 of these are cars and 1/8 are motorcycles.
So the number of vehicles that are not cars or motorcycles is given by:
N' = N - N/2 - N/8
Now we can take N as a common factor:
N' = N*(1 - 1/2 - 1/8) = N*(1 - 4/8 - 1/8) = N*(3/8)
Now we divide both sides by N to get:
N'/N = 3/8
So the fraction of the vehicles that are not cars or motorcycles is 3/8.
If you want to learn more about fractions:
https://brainly.com/question/1622425
#SPJ2