The phrase "heightened security measures" is correct and usable in written English.
You can use it when referring to measures taken to increase a security level, or when describing a state of increased vigilance. For example: "In order to ensure safety at the event, the venue has implemented heightened security measures."
It urged "extreme vigilance and heightened security measures".
PPPL is a federal facility and is currently taking heightened security measures.
By two-fifteen, police, following heightened security measures, were escorting Stuyvesant students out of the school.
That world, for the time being, will include heightened security measures nearly everywhere.
At busier airports like La Guardia and Kennedy, crowds and heightened security measures can create long lines.
This echoed Hollande's statements after the Charlie Hebdo attack, which emphasized solidarity and the defense of French values more than heightened security measures.
Tourists were advised to take heightened security measures after laboratory tests confirmed two Irish tourists returning from the Algarve in Portugal had the disease.
Well it shouldn't come as any surprise that heightened security measures across the Washington area will affect where you can go, what you can bring with you, and what you can do to document the inaugural events.
Separatist leaders in Kashmir have called for a general boycott of Mr. Singh's visit and schools and commercial establishments in the Kashmir valley have been shutdown in response to the boycott and heightened security measures.
The attacks came as France had heightened security measures ahead of a major global climate conference that starts in two weeks, out of fear of violent protests and potential terrorist attacks.
On Friday, Black Lives Matter announced that it was pulling out as a grand marshal, due to concerns about the police's plan to have an increased presence at the parade and heightened security measures.
