Heat on the Highway

As temperatures rise, so do the risks associated with tires, brakes, and overall vehicle condition. Summer heat doesn’t just stress drivers, it amplifies mechanical weaknesses, making maintenance and inspections more important than ever.

Hot pavement, heavy freight volumes, and extended daylight hours all place additional strain on commercial vehicles. Problems that may seem manageable during cooler months can escalate quickly in extreme summer conditions, leading to:

• Increased roadside breakdowns
• Higher out-of-service rates
• Greater crash severity when failures occur at highway speeds

Heat is one of the biggest contributors to tire failures and blowouts.

Hot pavement raises internal tire pressure, underinflated tires create excess heat, and worn tread struggles to dissipate that heat effectively. Summer construction zones also increase the amount of road debris drivers encounter. You should always:

• Check tire pressure when tires have been out of use for a while
• Inspect for uneven wear, exposed cords, or sidewall cracks
• Never push a questionable tire through a hot run

A blowout at highway speeds can quickly lead to loss of control, rollovers, or multi-vehicle crashes.

Brake systems already generate extreme temperatures during normal operation. Summer weather pushes them even harder.

Common Summer Brake Risks: 

• Brake fade and reduced stopping power
• Overheated drums, rotors, and pads
• Increased wear during downhill or stop-and-go driving
• Smart Brake Practices
• Inspect brakes carefully during pre-trip inspections
• Report burning smells, vibration, or pulling immediately
• Use proper gearing and avoid riding brakes on grades

Brake issues can dramatically increase stopping distances in traffic, work zones, and emergency situations.

Even with modern technology, nothing replaces a thorough inspection.

Pay extra attention to:

• Tires and tire pressure
• Brake condition and air systems
• Wheel ends, belts, hoses, and fluids

Fleets with strong inspection habits consistently experience fewer heat-related breakdowns and violations.

Summer heat doesn’t create defects, it exposes them. Tire care, brake maintenance, and consistent inspections can prevent costly breakdowns, violations, and crashes. Spending just 10–15 minutes on equipment checks each day can make a major difference in safety and operating costs during the summer months.