Lorries (Jack-Knifing) 5. Mr. Hastings asked the Secretary of State for the Environment what progress the Transport and Road Research Laboratory has made with its trials on anti-jack-knifing equipment for articulated lorries; and whether he will make a statement. Mr. Mulley The field tests of anti-jack-knifing equipment for articulated lorries have been completed, and preparation of the report is well advanced. I expect to receive the report shortly.