Final answer:
The left lateral decubitus position is recommended for transporting an obese or pregnant vomiting patient to maintain an open airway and reduce the risk of aspiration.
Step-by-step explanation:
In the case of transporting an obese or pregnant patient who is vomiting, the recommended position is the left lateral decubitus position, also known as the recovery position. This position helps to maintain the airway open and reduces the risk of aspiration, which is when vomit is breathed into the lungs. It is especially important for pregnant women due to the pressure of the uterus on the inferior vena cava when lying on their back, which can reduce blood flow to the heart. For obese patients, this position can also help alleviate pressure on the chest and abdomen, making breathing easier.