The mail coaches were originally designed for a driver, seated outside, and up to four passengers inside. The guard (the only Post Office employee on the coach) travelled on the outside at the rear next to the mail box. Later a further passenger was allowed outside, sitting at the front next to the driver, and eventually a second row of seating was added behind him to allow two further passengers to sit outside. Travel could be uncomfortable as the coaches travelled on poor roads and passengers were obliged to dismount from the carriage when going up steep hills to spare the horses (as Charles Dickens describes at the beginning of "A Tale of Two Cities"). The coaches averaged 7 to 8 mph (11–13 km/h) in summer and about 5 mph (8 km/h) in winter but by the time of Queen Victoria the roads had improved enough to allow speeds of up to 10 mph (16 km/h). Fresh horses were supplied every 10 to 15 miles (16–24 km). Stops to collect mail were short and sometimes there would be no stops at all with the guard throwing the mail off the coach and snatching the new deliveries from the postmaster.