Flying cars may be 25 years or more away。Next generation small aircraft may look like this Farnborough F1 concept。

As motorways become
more and more clogged up with traffic, a new generation of flying cars
will be needed to ferry people along skyways.

That is the verdict of
engineers from the US space agency and aeronautical firms, who envision
future commuters travelling by "skycar".

These could look much like the concept skycar shown in the picture,
designed by Boeing research and development.

However, such vehicles could be some 25 years from appearing on the
market.

Efforts to build flying vehicles in the past have not been very
successful.

Such vehicles would not only be expensive and require the skills of a
trained pilot to fly, but there are significant engineering challenges
involved in developing them.

"When you try to combine them you get the worst of both worlds:
a very heavy, slow, expensive vehicle that's hard to use," said
Mark Moore, head of the personal air vehicle (PAV) division of the
vehicle systems program at Nasa's Langley Research Center in Hampton,
US.

But Boeing is also considering how to police the airways - and
prevent total pandemonium
- if thousands of flying cars enter the skies.

"The neat, gee-whiz part is thinking about what would the
vehicle itself look like," said Dick Paul, a vice president with
Phantom Works, Boeing's research and development arm.

"But we're trying to think through all the ramifications
of what would it take to deploy a fleet of these."

Past proposals to solve this problem have included artificial
intelligence systems to prevent collisions between air traffic.

Nasa is working on flying vehicles with the initial goal of
transforming small plane travel.

Small planes are generally costly, loud, require months of training
and lots of money to operate, making flying to work impractical for most
people.

But within five years, Nasa researchers hope to develop technology
for a small plane that can fly out of regional airports, costs less than
$100,000 (￡55,725), is as quiet as a motorcycle and as simple to
operate as a car.

Although it would not have any road-driving capabilities, it would
bring this form of travel within the grasp of a wider section of people.
Technology would automate many of the pilot's functions.

This Small Aircraft Transportation System (Sats) would divert
pressure away from the "hub-and-spoke" model of air travel.

Hub-and-spoke refers to the typically US model of passengers being
processed through large "hub" airports and then on to
secondary flights to "spoke" airports near their final
destination.