Should it be 'in' or 'on' and is a hyphen needed?

[Tan Elaine]

After last year's floods on Orchard Road, the Public Utilities Board raised a 1.4(-)km stretch from Tanglin Road to Cairnhill Road by 30 centimetres.

1. I was taught 'in' Orchard Road, so why is 'on' used?

2. Is the hyphen in bold optional?

Thanks.

[5jj]

'In' is BrE; I think that 'on' may be AmE. I would use a hyphen in 'I.4-km'.

[Raymott]

After last year's floods on Orchard Road, the Public Utilities Board raised a 1.4(-)km stretch from Tanglin Road to Cairnhill Road by 30 centimetres.

1. I was taught 'in' Orchard Road, so why is 'on' used?
It's more than likely that the author did not go to the same school as you did. I'd guess that the floods also went over Orchard Rd, and along Orchard Road, and maybe also under and through the road before washing half of it away. Floods are one of those forces of nature that we can't control with grammar yet.

2. Is the hyphen in bold optional?
No, it shouldn't be there.
Thanks.

R.

[Barb_D]

The hyphen would be required in the style guides I follow.

A 6-ft ladder
A 30-cm pipe
A 1.3-km stretch of road

[Raymott]

OK, I'll concede that "It shouldn't be there" was a bit strong.
I guess that makes it optional or mandatory, so I'll go with "optional" as Tan Elaine originally proposed.