They also have fully rotating operator seat, removing the need for the machines to be driven backwards, a major cause of accidents involving rollers.
Rainer Baisch, Hamm's managing director, said: 'There are three or four Chinese companies with the potential to play a major role in this market over the next three to five years, so it's very competitive.
'Nevertheless, our aim is to challenge for, or be close to, market leadership.'
The target market in the UK will be contractors. 'It is up to the end users to drive the plant hire market forward,'said Mr Baisch.
Hamm has high hopes for the new tandem roller design. The joystick sits on one arm of the new swivel seat while the other arm is occupied by a control panel overseeing the machine's intelligent engine management system and compaction levels.
With no obstructions in front or behind, the seat can be rotated through 360 degrees to match the machine's direction of travel. This change in orientation is automatically
picked up by the joystick, which changes its position to reflect this, as do the mirrors.
'We believe the driver's role in the investment in and purchase of new kit is
growing, especially in the West,' said Mr Baisch.
'Roller drivers are often overlooked as the last step in the process of making a road, but they can undermine the entire job if they don't get it right. Once they
have sat in one of these they'll not want to drive anything else.
'I think that eventually all pivot-steer tandem drum rollers will have a swivel seat like the DV machines. Ninety percent of accidents happen while driving backwards, yet this accounts for nearly 50 per cent of a roller's work.'
The DV70 and DV90 also use the opportunity afforded by absence of a central steering wheel to open up visibility to the drum.
Other attributes include the ability to offset the seat within the cab and also to offset the cab itself up to 300 mm beyond the side of the machine.
The joystick incorporates an automatic button to allow crab steering, which increases the machines' compaction width by up to 95 per cent on DV 40 and 80 per cent on the DV70 and DV90.