The phrase "authorities to prepare" is correct and usable in written English.
It can be used in contexts where you are referring to the responsibilities or actions that authorities need to undertake, often in relation to planning or readiness.
Example: "The government has given the authorities to prepare for the upcoming natural disaster."
Alternatives: "officials to arrange" or "agencies to get ready".
NATO nations have not yet asked the alliance's military authorities to prepare contingency plans for such steps, diplomats said.
Last month, a PAHO report advised health authorities to prepare for "a potential burden at all levels of health care" as the Zika virus continued to spread.
"The committee is working with the parliamentary authorities to prepare a draft bill to deliver the necessary reform to the structure of the FA," Collins' reply states.
The environment minister, Dan Rogerson, said the Environment Agency was working closely with local authorities to prepare for any localised flooding.
We have spent two years working with local authorities to prepare for the changes and have been speaking to those who have raised concerns.
Four days and three killings after the shooting, the police found a note from the sniper demanding $10 million and warning the authorities to "prepare your body bags" if it was not delivered.
One provision would remove the Transportation Department's authority to prepare regulations limiting the number of hours truckers may drive without a rest.
Where are the leader-to-leader phone calls, the military consultations, the urgent dispatch of senior envoys with explicit presidential authority to prepare summit-level meetings to catalyze a way out of the crisis?
The authorities want to prepare public opinion for the eventual extradition of Mr Milosevic to the UN's war-crimes tribunal in The Hague.
In doing so, we made it clear authorities needed to prepare for the challenges to come".
Another result is that there is little pressure on local authorities either to prepare contingency plans in case of major destruction by landslides, or to enforce stricter building codes to reduce the persistent damage caused by creep.
