The phrase "are relied upon" is correct and usable in written English.
It can be used when discussing something or someone that is depended on for support, assistance, or information.
Example: "In times of crisis, the community leaders are relied upon to provide guidance and support."
Alternatives: "are depended on" or "are trusted for".
The projections are relied upon by Wall Street analysts and investors.
So sources like "one longtime ally," "someone" and "a close family friend" are relied upon.
Their products are relied upon by industries and by the communities in which they live and work.
And they're kept far away from the blockbusters that are relied upon for most of the industry's income.
The School Report and school profile are read in tandem with the transcript, and are relied upon heavily.
"Credit cards are a strong economic driver and are relied upon by consumers and small businesses to make payments and to bridge short-term financial gaps".
Google grants are relied upon to pay for adverts that counter search results that appear to deny that the Holocaust happened, a Jewish heritage museum said on Wednesday.
In the past, the cyclist counts have often been released in the fall, and are relied upon to demonstrate growing demand for a robust bike network.
But the track record of mergers in the industry is spotty, in part because of the difficulties of cutting costs in a R&D-intensive business where companies cannot simply drop products that are relied upon by global telecom operators.
Though a state issue, the ongoing dispute has helped the Coalition's chances of holding on to key marginal seats in fire-prone Victorian electorates where CFA volunteers are relied upon, including Corangamite and La Trobe.
Although a state government issue, the debate featured in the federal election campaign, with the prime minister, Malcolm Turnbull, visiting key marginal seats in fire-prone electorates where CFA volunteers are relied upon.
