GMAT Essays (AWA)

QUESTION :-
The installation of high-speed scanning devices at the entrances and exits of toll roads will obviate the need of toll booths. Automobiles will have scanner-sensitive license plates, like bar codes on consumer goods, so that scanner devices will record the license number of cares entering and exiting toll roads. Car owners will be billed monthly by highway authorities.

ANSWER:-
Firstly, the writer states that the installation of high-speed scanning devices at the entrances and exits of toll roads will obviate the need of toll booths. No mention is made of what convinces him to make this fact obvious, there can be some other way of installing high speed scanning devices. Nowhere is it stated that this plan is approved by some higher authority or what is the basis of this saying.
Secondly, the writer presents the analogy of bar codes on consumer packaged products, to show how the scanner-sensitive license plates will work for automobiles. To understand it clearly, we need to know the functioning of bar codes well, 2-3 lines regarding the same would have been helpful for even a layman to understand his point of view. And since scanner-sensitive license plates are still unimplemented, one cannot be convinced of its working.
Lastly, he says that highway authorities will bill the car owners monthly. It is a feasible plan for cars plying on toll roads on a frequent basis, but not for cars which might not turn up more than a few times, as they might not turn up on the bill-paying day! As we are told about the authorization of the plan, we cannot comment on the practicality of it all.
In essence, a more detailed approach, underlying all the possible scenarios, would have been beneficial for us to get to the gist of it all in an clearer way.