Indonesian volunteer biker Sebastian Dwiyantoro and his team have been particularly busy helping ambulances navigate heavy traffic in Jakarta's satellite city of Depok to get Covid-19 patients to the hospital as infections soar in the country.

The volunteers ride motorbikes in front of the ambulances, the deafening noise of the sirens behind them, freeing up space and stopping other cars to make way for ambulances carrying the sick to medical facilities or corpses to graveyards...