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Safety can be seen as an industrial issue and the relevant factors are Legality, Insurance, Engineering and Cost.

But I am taking people who use wheelchairs cross country. I can cover my backside with a legal disclaimer, but family, friends and carers don’t want to sign away the right to a safe return, and I am too lazy to make the effort to persuade them, so I made the activity safe.

Engineering

The heart of the safety system is the Instant Pony Release System developed for my Saddlechariot in 2006 ish with the help of Lancaster University Engineering Department Product Development Unit. It has improved consistently since then, working withKingston University and endless engineers. One of the pleasures of working with engineers, speaking as an inventor rather than an engineer, is their enthusiasm for helping people solve problems. 

Legality

My work is taking people who use wheelchairs cross country in a pony powered vehicle. Therefore my Obamobile vehicles are work equipment and subject to PUWER 1998. Regulation 19 states: 

Isolation from sources of energy

19.—(1) Every employer shall ensure that where appropriate work equipment is provided with suitable means to isolate it from all its sources of energy. 

The term horsepower should make it pretty obvious the source of energy in a horse, or pony drawn vehicle. And the Instant Pony Release System does what it says on the tin and isolates the Obamobile vehicle from the pony. Video proof here.  https://youtu.be/xzGlvUoJ-Go?si=jAFSClNxkKCjUhcg

Insurance

In 2007 I talked to the NFU Mutual Insurance Equine expert in the York office who said my Saddlechariots “are glorified horse drawn vehicles with extra safety mechanisms fitted.”

Since Insurers are well aware that anything with extra safety mechanisms is safer than things without, that puts my vehicles at the top of the safety tree.

Since 2011, Steve Barrett of Lloyd Whyte Insurance Brokers has sorted out my Insurance for pony powered wheelchair enabled access. The trick to making your Insurance broker a friend, is inventing safe systems (and having no claims).

Cost

The people I work with start as clients and become friends. I don’t do a cost benefit analysis on my friends, but I know I don't want a result like this.

https://www.horseandhound.co.uk/news/carriage-driving-nurse-broken-leg-air-ambulance-quilt-498912