The route was converted to low floor in 2000, and to a 24-hour service on 21 October 2005.

This route was converted into full air-conditioned service on September 23, 2011.

On 1 December 2007, route 111 was converted into a 24-hour service.

The route was converted to low floor in 2000.

In 1980, the route was converted to one man operation buses.

In 1988, the route was converted to single person double deck operation.

In 2002 the route was converted again to low floor operation.

In 1973, the route was converted to double deck operation.

In addition the entire route is being converted to four tracks.

By 2003, the route was fully converted to low floor operation.