As harsh as it is, the fact remains that safety does have a price. If there wasn't a threshold for cost then all cars on the road would be built like a NASCAR car and be able to withstand a 200 MPH crash and everybody walks away.
Whether or not this brake system makes it into production on any mower is up to the manufacturers. They will have to evaluate it's costs, benefits and liabilities.
I've seen people ask if there will be a system to fit their specific mower. You have to read what Ted is saying. He doesn't appear to be interested in selling these systems individually. He had said it repeatedly that his main target is the manufacturers. He said that, and asked us to help him, in the first braking system he showed us last year. He again repeated it in this thread.
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