Mayor's Questions - HGV action

I've been looking for the right place to ask this question and I figure I'll just do it here:

I assume that the HSE do not look after cyclist/HGV deaths? For instance, the HSE keep statistics on all the H&S related accidents/fatalities from last year in the construction industry. They claim of 53 deaths only 3 were members of the public. The HSE website states:

[*]Fatal accidents involving workers travelling on a public highway (a ‘road traffic accident’). Such incidents are enforced by the police and reported to the Department for Transport. Those killed whilst commuting (travelling from home to work, and vice versa) are also excluded.

Does this make sense? If these instances are not reportable under RIDDOR then what incentive is there for contractors to carry out risk assessments and plan/manage the health and safety of the public off their site. For example, if they were reportable then wouldn't someone like Mace be carrying out detailed risk assessments of their haulage journey planning and routes from the Shard? It might make them segregate the routes, or avoid peak commuter times.

My reasoning (as applied to the above example) is that if you stick a fatality onto Mace's contract record there would be the kind of financial incentive for them to avoid traffic during peak commuter periods. Or ensure that the tippers used on their projects have all the most state of the art safety measures in place.

But perhaps it would be unfair to have traffic incidents reportable to the HSE for haulage companies. I haven't thought the problem through fully. I just know that all major contractors take H&S exteremely seriously, and all other risks to the public and employees on a construction site are incredibly well managed. If we added transport/highway injuries as reportable it might encourage contractors to take measures further on their own backs.