It is harmful because motor vehicles spit out gas and like fumes. That can lead to pollution in the air.
It is beneficial because it helps people get to places they need to get to quicker
The main difference between inductive and deductive reasoning is that when we're doing inductive reasoning we're trying to create formal rules or formal inferences from a limited set of information, while during deductive reasoning, we're trying to deduce what would happen in a certain case based on general information available.