Launching a major new guide aimed at business leaders, he said that there are business as well as environmental benefits.
Green transport plans consist of measures aimed at reducing car journeys, to work and at work and making car and lorry fleets greener. Lord Whitty set out why staff should be encouraged to travel to work by public transport, cycling or walking.
Lord Whitty said: 'Seventy percent of people now travel to work by car, four out of five as the sole occupants. That is just not sustainable. We have serious problems regarding pollution, noise, congestion and increased journey times.
'Setting up a green transport plan can save your company money and make life healthier for your staff. At the same time you'll be doing your bit for the environment.'
Copies of the guide are being distributed free to all major employers in the UK and to local authorities.
Lord Whitty also unveiled a new, single number for public transport enquiries in Lancashire - 0870 608 2608 and met school children who have designed posters to promote Green Transport Week.
1. Copies of the guide 'Green Transport Plans' can be obtained from DETR Free Literature, PO Box 236, Wetherby, LS23 7NB. Tel 0870 1226 236 or fax: 0870 1226 237.
2. For more details on Green Transport Week contact the Environmental Transport Association on 01932 828 882.
3. More information on the 'one-stop' public transport phone line in Lancashire is available from Lancashire CC press office on 01772 263 537.