The name of this blog, Rainbow Juice, is intentional.
The rainbow signifies unity from diversity. It is holistic. The arch suggests the idea of looking at the over-arching concepts: the big picture. To create a rainbow requires air, fire (the sun) and water (raindrops) and us to see it from the earth.
Juice suggests an extract; hence rainbow juice is extracting the elements from the rainbow, translating them and making them accessible to us. Juice also refreshes us and here it symbolises our nutritional quest for understanding, compassion and enlightenment.

Wednesday 27 October 2021

Is Our Commuter Hierarchy Upside-Down?

In 1865, the U.K. Locomotive Act required, in the case of multiple-wagoned road vehicles, that a man bearing a red flag walk at least 60 yards in front of the vehicle. Furthermore, vehicles were restricted to 4 m.p.h. in the countryside, and 2 m.p.h. in cities.

Since this and other restrictions were lifted towards the end of the century, our commuter hierarchy has been turned on its head.

No matter where we go (in cities or in countryside) it is hard to escape the realisation that the car is king. Roads are designed primarily for the private motorcar. Footpaths are shunted off to the side, if they exist at all. Cycleways are often an after-thought.

The hierarchy nowadays is clearly the car is at the top, followed by the cyclist, with pedestrians at the bottom of the pyramid of privilege and right-of-way.

Yet, if we think in terms of vulnerability then, surely, we have the hierarchy upside-down.

Consider a collision between a private car and a cyclist, or a private car and a pedestrian. We all know who is going to come off worst.

The physics alone should tell us. Damage done in a collision can be attributed in big part to the kinetic energy (KE) of the colliding bodies. KE is easily computed if we know the mass (m) of the body and the velocity (v) at which it is travelling.1 Kinetic energy is measured in Joules. The greater the number of Joules, the greater the energy. Consider these measurements:

The average mass (weight) of a private car is 1300 kg. Suppose a car is travelling at 50 km per hour (13.9 metres per second) then the kinetic energy of the vehicle is approximately 125,000 Joules (J). Travelling at 30 k.p.h. (8.3 metres per second (m.s.)) turns out to be approximately 45,200 J.

A male cyclist, on the other hand, weighing 87 kg (the average weight for an adult Australian male) and cycling at 20 k.p.h. has a kinetic energy of approximately 1,400 J. At 25 k.p.h. the kinetic energy is over 2,200 J. For an average Australian woman, the equivalent kinetic energy is 1,200 J and 1,900 J respectively.2

Now, consider a pedestrian, walking at 5.5 k.p.h. (1.6 metres per second). The kinetic energy of an average Australian male pedestrian is about 110 J. For an average female pedestrian, the kinetic energy is about 90 J.


Imagine a car with a kinetic energy anywhere from 45,000 J to 125,000 J colliding with a cyclist with between 1,200 J and 2,200 J. Who is going to be damaged the greatest?

What about a pedestrian with kinetic energy of only around 100 J?

Surely, if we are serious about lives, potential damage, and harm, then we should be upending our commuter hierarchy. The car is king does not make sense in terms of vulnerability.

It Doesn’t Make Sense in Other Ways

Nor does giving the private vehicle its high esteem and privilege make sense in other ways.

The private vehicle is possibly the most environmentally damaging piece of technology that an individual can own. We have known for decades the damage from exhaust fumes. We know too the damage that the road network has on local ecosystems, as well as the sheer amount of land given over to parking and roading that our addiction to the motor-vehicle requires.

Plus, our addiction to the private vehicle as a means of transport has seen our weights rise, so that now obesity rates in some parts of the world are at epidemic levels. We have sacrificed well-being for comfort.

Should we not be thinking it is time to turn our commuter hierarchy up the other way, so that we privilege the most vulnerable? 

Time to bring back the red flag.   


1. The formula for those interested is KE = ½ mv2

2. Using an average bicycle weight of 8 kg. The kinetic energy will vary from person to person. Significantly, for a child the kinetic energy is much less.

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