Australia's biggest project development group says the Federal Government's temporary skilled migration visa program should be extended to all classes of workers.

Leightons chief executive Wal King says the company has more than 500 employees on 457 visas.

He says the program is very effective in solving skills shortages.

But he says certain categories of workers, such as truck drivers, are not allowed to work in Australia under the scheme, even though they are desperately needed.

http://www.abc.net.au/news/stories/2008/08/14/2335513.htm?section=business