Recently I have noticed quite a few people sitting in vans and utes, parked with the engine running. They appear to be on-call workers, prepositioned around the city, waiting to be called to fix something. Also I noticed an electric car charger which can also be used to return power to the grid. Perhaps parking spaces could be distributed around the city, equipped with charging, for service vehicles. The drivers could either wait in the vehicle, or in the modern equivalent of a Cabmen's Shelter, nearby.