HK Police bike From the position of the pipes it is possibly a Honda CB450P.
Note the Austin A60 on the right.
Black bike with the hooded head light fairing. Green sedan above is an Australian Ford Falcon [XY] and Mercedes-Benz is listed here /vehicle_212778-Mercedes-Benz-Unknown.html
The bike has a non-standard hump-backed seat but I think it is a Honda CB77 from 1966-7. There are plenty of similar ones on google images.
Green bike on left
1972 Honda SL100.
Silver bike on right. 125 badge in second thumbnail
Honda SL125 1971-74.