In 1902, the surface of Queen's Road (modern-day Queensway) was macadamised, which meant that when the weather was dry, traffic stirred up a lot of dust.
One of the government's solutions was to use water carts like this. Teams of workers pulled the carts along the road, and the carts sprayed out water from the pipe at the back to help keep the dust down.
(Detail cropped from page 60 of the new Volume 4 of 'Old Hong Photos and The Tales They Tell'. The book will be available in November 2020.)