
Proposed Five New Road Rules for Bunch Riders based on calculations  i) available in Bicycle Brake Stop Calculator; ii) set out for various speeds and gradients in 'SummaryStoppingDistances.xlsx'; iii) which accord with calculations in Figure 19 on page 40 "Stopping Sight Distance" of “Guide for the development of bicycle facilities” produced by the 'American Association of State Highway and Transportation Officials' explained in Chapter 22 Two mathematical formulae exist..........
i), ii) and iii) above calculate 'inter alia' the following Distance To Brake to Stop examples for a cyclist that weighs 68.1 kg (150 lb) on a dry road surface with dry brake pads and wheel rims, travelling on a  * level roadway with a velocity (speed) of 20km/p/h, the Distance To Brake to Stop is 20.2m. * level roadway with a velocity (speed) of 40km/p/h, the Distance To Brake to Stop is 53.0m. * 5% descent with a velocity (speed) of 20km/p/h, the Distance To Brake to Stop is 21.8m. The 4th last and 3rd last paragraphs in Chapter 14. "Bunch Riding On Australian Roads Is Illegal" explain that  i) road bicycles have relatively inefficient braking equipment, particularly under wet conditions, and ii) brake application is restricted because bicycles are top heavy, otherwise the rider will pitchover the handlebars.
Proposed Five New Road Rules
1. New rule re 'Safe distance behind' to enable reasonable time to steer around a fallen cyclist(s) ahead: Unless overtaking, a cyclist must remain at least  * one bicycle length (1.6m) behind the rear wheel of a bicycle immediately ahead when travelling up to 10km/p/h; * one additional bicycle length (1.6m) behind the rear wheel of a bicycle immediately ahead for each additional 5km/p/h beyond 10km/p/h; and * one additional bicycle length behind a bicycle immediately ahead when descending a slope for each additional 2% gradient. Example are, when  (a) descending a 4% slope at 40km/p/h, a cyclist must remain at least 9 bicycle lengths (7 for speed + 2 for descending a 4% slope) behind the rear wheel of the bicycle ahead, which is 14m (9 x 1.6m); (c) descending a 10% slope (a steep descent) at 30 km/p/h, a cyclist must remain at least 9 bicycle lengths (5 for speed + 5 for descending 10% slope) behind the bicycle ahead, which is 16m (10 x 1.6m); and (d) descending a 10% slope (a steep descent) at 60 km/p/h, each cyclist must remain at least 16 bicycle lengths, (11 for speed + 5 for descending a 10% slope) behind the bicycle ahead which is 25.6m (16 x 1.6m). Materially increasing the distance between the rear wheel of the bike ahead and the front wheel of the bike behind to a minimum of two bike lengths would (up to 10km/p/h) – i) increase the peripheral vision of Bunch Riders behind; ii) provide more time to react to signals given by riders ahead of imminent Hazards To Bunch Riders ahead; and iii) enable more time to avoid a fallen Bunch Rider(s) ahead.
2. New rule re 'Cycling two abreast':
3. New rule re 'Maximum cycling speed in a Bunch Ride': No cyclist on Australian roads shall ride a bicycle in a Bunch Ride at greater than 50 km/p/h.
4. New rule re 'Maximum number of cyclists in a Bunch Ride': Not more than 14 cyclists [7 cyclists deep x (1.6m x 3 bicycle lengths) less 2 bicycle lengths not measured behind the final bicycle = 30.4 metres minimum possible Bunch Ride length] shall ride in a Bunch Ride.
The length of a 14 cyclists
Bunch Ride could extend to
88 metres minimum when descending a
6% slope at 35km/p/h
[7 cyclists deep x (1.6m x 9 bicycle lengths [6 bicycle lengths for
speed + 3 bicycle lengths for descent slope] = 6 bicycle lengths x 14.4m + 1.6m
= 88 metres 5. New rule re 'Distance between each Bunch Ride unless overtaking': Unless overtaking another Bunch Ride that is ahead, no Bunch Ride shall ride within 60 metres of another Bunch Ride. When a Bunch Ride is overtaking another Bunch Ride, riders in the overtaking Bunch Ride must not rider two abreast.


