at/in/on numerous areas

[Tan Elaine]

Prolonged heavy rain which fell over a three-hour period over the southern and central parts of Singapore resulted in flash floods at numerous areas. Cuscaden Road, Newton Circus, Kampong Java, Lincoln Road, Wee Nam Road, Cambridge Road, the junction of Moulmein and Thomson roads in front of United Square, and the junction of Bukit Timah Road and Sixth Avenue were affected.

Should the word in bold be 'in'? I believe in American English, it should be 'on'.

Thanks.

[bhaisahab]

No, I would expect the word to be "in".

So would I.

[emsr2d2]

... in numerous areas
... at numerous locations