To flag down a means of transport/vehicle (informal).
To hail a means of transport/vehicle (slightly formal)
"You wait here with our bags while I hail a taxi.
Cambridge Dictionary Online.
"Shall we hail a taxi?"
Cambridge Dictionary Online.
"I managed to flag down a passing police car."
Cambridge Dictionary Online.
"A police officer flagged us down."
Cambridge Dictionary Online.
In Modern Literature:
"It was not until they had gone an entire block that Langdon finally spotted a cab rounding the corner. He flagged it down, and the cab pulled over."
The Lost symbol by Dan Brown.
In News:
"According to him, five men flagged down his cab and asked to be brought to Barangay Holy Spirit."
Inquirer News.
"Boise PD says officers were flagged down by a taxi cab driver Saturday at about 11 p.m. about a woman who tried to skip out on a taxi fare."
KBOI2.com
"Part II of our series “Hack Job” features an inside look at a TLC crackdown and an interview with TLC Commissioner David Yassky who attempts to hail a cab to Brooklyn, where he actually lives.








