I've had a bit of a look at the WA laws, and only found:
- Road Traffic Code, 2002, sec 229(a):
"shall not ride a bicycle while under the influence of alcohol ... to
such an extent as to be incapable of having proper control of the
bicycle." Penalty: 2 units. ($100?) No demerits.
For a motor vehicle, DUI (same wording) is assumed if blood alcohol
is over 0.15, but that doesn't apply to cyclists.
- The Road Traffic Act only sets limits for motorists.
- There is also a small "Road Traffic (Bicycles) Regulations 2002", but
thats just about bikes, not riders. (Mudguard surface facing rear
must be silver or white, BTW)
Are there any other applicable documents that those three?
So legally, you can drink as much as you can without getting wobbly.
Another good re4ason to ride :-)