No Drivers In Range

Ride matching searches the rider's cell at a resolution tuned for dense cities. In a sparse suburb the search returns zero drivers and the request fails instead of dispatching the car parked three streets away. What is the right correction?

Lower the resolution globally so that one cell always contains at least one driver everywhere in the service area

Expand ring by ring from the rider's cell until enough candidates appear, then rank them by road network ETA, not straight line distance

Raise the resolution in sparse regions so each cell covers a smaller area and the index becomes more selective for those queries

Skip the spatial index in sparse regions and compute haversine distance from the rider to every driver in the fleet, then take the closest