speed limit in the upper swan

not sure if its been posted already but to those who spend time in the swan, are you aware of the speed limit change?

i found out on sunday by the enforcers, just a freindly warning for now they said.

from the belmont ski area(maylands ramp) up to the guildford rd bridge has changed from 8knts to 5knts wich is idle speed.
then from guildford rd bridge up stream is 4 knts.

i have spent many many years in the upper swan and dont take any notice of the signs anymore and just travell along at 8knts, was a supprise when they pulled me over and informed me of the change.
it is also well signed i noticed once they told me, and has been for the last 2 weeks.

i also noted that the ferrys were not doing 5knts, maybe they are exempt?????

cheers ron