There are also guidelines requiring one-handed operation and a two second limit on "off-road glances" - the time spent looking at the device.

BBC: Hi-tech cars: Driver distraction warning in US

By the end of the year, when the Fed has sold the last of its short-term bonds, Operation Twist will have reached its limit.

ECONOMIST: The Federal Reserve extends Operation Twist

There is, though, a natural limit to co-operation.

ECONOMIST: What regulators should do now

Too often, however, the drive to further regulate these funds and limit their potential scope of operation is occurring in a vacuum devoid of detailed knowledge of their structure and evolution.

FORBES: Private Equity, Hedge Funds Must be Understood to be Regulated Effectively

The operation targeted class-restricted vehicles on national speed limit roads on 30 January and 26 February.

BBC: Two-day speeding operation results in 400 prosecutions

Tiscali had stretched its resources to the limit by building up its Italian Internet operation, as well as buying in Belgium, France, Switzerland and Germany.

ECONOMIST: Internet mergers

It would be extremely foolhardy for us to divulge information in the recounting of what happened on Sunday that would in some way -- in any way limit our capacity to perform a similar operation in the future.

WHITEHOUSE: Press Briefing

And the problem is, is that if we engage in this kind of thing, it leads to those areas that unwittingly could have the divulging of information that would limit our capacity to do this kind of operation in the future.

WHITEHOUSE: Press Briefing