Chains are very noisy and undesirable on snow-free roads, and speeds must be kept down, so most people would very quickly take them off once out of snow because the vehicle simply does not drive well except in snow. Additionally, the chains get worn and damaged quickly out of snow. They are not difficult to fit or remove except you must reach in behind the wheels to clip the two ends together or undo them - the worst thing is you will be doing this in quite low temperatures, but in snow it is at least very clean work. You are correct to be astonished that public service vehicles do not appear to be equipped with them, even though they are only needed a few days a year. The laughable situation was apparently reached recently when a snow plough got stuck. The lack of preparedness does seem to be astonishing - the snow barely covered the ground, what will happen when the 20 year storm (the size which statistically occurs five times per century) arrives ? No breakdown, police, fire, ambulance or any service of any kind (including electricity supply restoration crews) when everyone says "Act of God, unforeseen, nothing could be done" ?