Traffic Lab is a Seattle Times project that digs into the region’s transportation issues to explore the policies and politics that determine how we get around and how billions of dollars in public money are spent.

Ask any bike advocate how to fix any problem, and the answer comes quickly: more bikes.

When it comes to freeing up Seattle’s valuable curb space, chipping away at its entrenched congestion and meeting its oft-repeated goal of reducing harmful greenhouse gases, the bicyclists may be right.

The Seattle Department of Transportation is considering new rules for electric cargo bikes, an effort it says will do all of the above, and more. In a city saturated in delivery vehicles and with little extra space, e-cargo bikes — which can carry upward of 800 pounds — may supply the last-m

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