The literature and practice in automotive safety has evolved over time but the basics are a safety cell, crush zones, roll over protection, and a restraint harness. For a velomobile a full enclosure with ventilation such as used in sailplanes would protect one from rain and bugs. An opaque roof would reduce cabin heating. I design my upright bike fairings so far as open cockpit shells with a helmet. Top speed is expected to be 30 mph and I am considering an inertial reel lap belt to keep from going over the handlebars in a crash with a car. I will be looking into hard shell panniers for side impact as well as drag reduction.
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