A driver with a history of diabetes and hypertension describes recurrent light headedness while driving in his truck during hot weather. What should you advise him to do?

Advising the driver to monitor his fluid intake is essential because dehydration can exacerbate symptoms of lightheadedness, particularly when combined with diabetes and hypertension, especially in hot weather. Both conditions can affect fluid balance and blood pressure regulation. When it's hot, the body loses more fluids through sweating, which can lead to dehydration, increasing the risk of lightheadedness or dizziness.

By ensuring adequate fluid intake, the driver can help maintain proper hydration, thereby supporting both his blood sugar levels and blood pressure. It’s critical for someone with diabetes to avoid dehydration to prevent any complications related to their condition.

The other options may not address the root cause of the symptoms effectively. Increasing the hypoglycemic dose without understanding blood sugar levels could lead to hypoglycemia, while decreasing anti-hypertensive medication might worsen hypertension. Additionally, finding a new job is an extreme suggestion when adjustments to hydration and monitoring his health can be effective solutions.