From BQ news page
, about halfway down the page:
Riding Mt Coot-tha and safety
Mt Coot-tha has long been a popular hill-training ride venue for Brisbane cyclists, and with the state government's construction starting of a new cycle link over Centenary Highway (to avoid the dangerous Mt Coot-tha roundabouts) more people may be venturing up the hill.
BQ supports unrestricted access to Mt Coot-tha, as it is a fantastic scenic asset to Brisbane and cyclists like to train there.
But BQ does advise against descending the hill down the 'back way' - that's clockwise from the ABC and Channel 10 towers down to Simpsons Road.
Why? Here are some reasons:
It is steep, and hard to stay within the speed limit of 50kph.
It has blind corners.
The risk of the unexpected - from rocks to scrub-turkeys on the road - is real.
With cyclists travelling up the hill at about 10 kph and the narrowness of the road, it is likely that cars overtaking cyclists will be very close to the centre line, so a momentary mistake by a cyclist that puts them on or over the centreline can have dire consequences.
The risk of brake failure or hand fatigue for less experienced cyclists is a possibility.
There are walkers on the road - bushwalkers and joggers often can be on the road or either side of the road (whether they should be or not!) It happens.
There is motor traffic! The road is the access for hundreds of employees of the TV stations, the Summit Restaurant and a host of general park users. Most drive courteously, but mistakes or impatience can happen.
Thus BQ strongly recommends all cyclists:
a. Only climb (don't descend) in an anti-clockwise direction on the 'back' of the Coot-tha (the steep section from Simpsons Rd to Channel 10
b. If doing repetitions (multiple "up and backs") or if just doing the Coot-tha for fun, then use the 'front' side - take the first left when coming up from the Botanic Gardens and continue up to the Summit Restaurant or further along the ridge to the official high point just before Channel 10 - but not down from there.