Labour wants a Parliamentary inquiry into trucking industry safety.
Transport safety spokesman Iain Lees-Galloway has asked for an inquiry before and says he has new information which makes it even more urgent.
"We have been told overloaded livestock trucks are rolling over with shocking regularity, maiming animals and endangering people's lives," he said.
"At the centre of unsafe trucking is the pressure placed on drivers to meet incredibly tight deadlines and to load their vehicles beyond their maximum capacity."
Mr Lees-Galloways's previous appeal for an inquiry was based on a report which said some drivers were using drugs to stay awake so they could meet deadlines.
He's going to ask the transport select committee to carry out a wide-ranging inquiry and recommend ways to improve safety.
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