Lowbridge double-deck bus

However, the lowbridge type started to become obsolete when low-height chassis were developed, which used a dropped-center rear axle to enable the lower-deck gangway to be lowered.

As a result, some Atlanteans were built to a "semi-lowbridge" layout, with the front half of the upper deck laid out conventionally, and a side gangway with raised seating area towards the rear.

To facilitate this, East Yorkshire Motor Services had a number of double-deckers built with special "Gothic" roofs of severely-arched profile from 1935 to 1970, when a bypass road was opened around the Bar, to match the shape of the arch.

[3][4][5] Similarly, North Western ordered a number of single-decker buses with an unusual roof profile to clear a very low road bridge under the Bridgewater Canal at Dunham Massey.

[6] The last lowbridge double-decker to be built was bought by Bedwas and Machen UDC, a small municipal bus fleet in south Wales, in 1968.

Following its sale by B&MUDC's successor, Rhymney Valley District Council, it was operated by Stevensons of Uttoxeter and subsequently by MK Metro of Milton Keynes.

A preserved Leyland Titan TD1 of Glasgow Corporation at the Scottish Vintage Bus Museum
The sharply-arched Beverley Bar necessitated a special bus design. A preserved East Yorkshire Motor Services AEC Bridgemaster with an arched roof passes under the Bar in August 2022.
Bristol Lodekka FS6G – the first British alternative to the lowbridge design
Barton's unique Dennis Loline , 861