Possessive or Plural?

I’m building a list of real-life grammar error examples, based on my writing, researching, and reading. These examples will all make titallating class materials at BCIT or when I publish my own version of Strunk & White. The examples below focus on confusion about pluralization.

ICBC

As an insurer and issuer of driver licences, we make decisions which can have a significant impact on peoples’ lives.

Problem: People is already plural, so the apostrophe is misplaced. Also, the sentence should use that and not which as it’s restrictive. In editing, the lack of a comma is a giveaway that the writer was uncertain anyway—using which always requires a comma.

Correction:

As an insurer and issuer of driver licences, we make decisions that can have a significant impact on people’s lives.

Construction Company

ABC Crane Service is an Oklahoma based crane rental company that provides crane service nationwide. Their fleet of cranes range from 80 to 660 tons and have been used in projects to solve challenges such as…

Problem: In the second sentence, the subject is fleet, which is a collective noun (therefore treated as singular). The confusion arises from the words cranes and tons (clearly plural) closer to the verb have, but the collective should prevail so it should be has. Other copy errors are indicated, (and corrected), in underscore.

Correction:

ABC Crane Service is an Oklahoma-based crane rental company, which provides crane service nationwide. Its fleet of cranes ranges in size from 80 to 660 tons and has been used in projects to solve challenges such as…