Designing for Chaos:

Emergency vehicles don’t operate in controlled conditions. They move through downpours and dust storms, endure extreme heat and bitter cold, and remain exposed to constant vibration, moisture, and wear. In these environments, failure isn’t inconvenient - it’s unacceptable.

Designing technology for that reality means anticipating the unpredictable. At Whelen, that process doesn’t start in the field. It starts in the lab, where our products are pushed far beyond the conditions they’re expected to face.

Inside Whelen’s environmental test lab, the “real world” is recreated and intensified.

Products are subjected to a wide range of environmental stressors: temperature extremes, high humidity, UV exposure, water intrusion, dust, corrosion, and continuous vibration. These are not theoretical scenarios. They reflect the daily realities of emergency vehicles operating across climates and terrains.

As Mechanical Engineering Supervisor Will Browne explains, the lab is built around one idea: replicate anything a product might encounter once it’s deployed.

“The environment would be anything that a product experiences out in the real world - vibration, moisture, corrosion, dust, extreme temperatures, UV exposure…weather in general.”

Recent upgrades have expanded those capabilities. A new RF room tests products to ensure they meet electromagnetic compatibility standards and operate reliably without causing or experiencing interference. A larger vibration shaker increases the intensity and scale of mechanical testing. And a high-pressure, high-temperature water spray system introduces conditions far more aggressive than typical rain or road spray, pushing product sealing to new limits.

Together, these systems allow engineers to simulate not just harsh conditions, but sustained exposure to them.

Baseline requirements are only the beginning.

At Whelen, products are routinely tested beyond what they are expected to encounter in the field. The goal isn’t simply to confirm functionality - it’s to build confidence under worst-case conditions.

“We have some of our own extreme tests that go well beyond what’s required,” Browne says.

These tests are designed to expose weaknesses before they become real-world failures. In thermal shock testing, for example, products are subjected to high heat and then rapidly cooled in an ice bath. This abrupt transition stresses materials, seals, and connections, revealing vulnerabilities that might otherwise go unnoticed.

Vibration testing follows a similar philosophy. Instead of simulating only typical use, products are pushed through intensified cycles to replicate long-term wear in a compressed timeframe.

The result is a clearer picture of how products behave not just on day one, but after years in the field.

Real-world conditions rarely occur in isolation.

A vehicle may experience rapid temperature swings, sustained vibration, and moisture exposure, all within a single shift. Designing for that reality means thinking beyond individual tests and considering how materials and assemblies respond under compounded stress.

Our approach focuses on pushing those limits. Products are evaluated for how they expand and contract, how seals respond under pressure, and how components hold together under repeated strain.

Even mounting systems are tested under extreme conditions. In one instance, we conducted high-speed testing on an airstrip to evaluate how lightbar mounts perform under intense driving scenarios.

Durability, in this context, isn’t about surviving one condition - it’s about enduring many, often at the same time.

Not every product passes on the first try and that’s intentional.

Failures in the lab are an essential part of development. They provide insight into where designs can be improved before products are deployed in the field.

“Sometimes we’re surprised,” Browne says. “But it’s part of the learning experience. We find the flaw, redesign, and test again.”

Because testing is conducted on-site, engineers can observe results in real time. That proximity creates a fast feedback loop - issues are identified, adjustments are made, and new iterations are quickly retested.

This iterative process ensures that performance is not assumed, it’s proven.

Environmental testing isn’t a final step. It’s integrated throughout development.

From early prototypes to final production samples, products are repeatedly tested to validate design decisions and confirm durability. Each phase builds on the last, refining performance and identifying potential issues before they scale.

This approach also ensures consistency. It’s not enough for a single prototype to perform well. Products must demonstrate that same reliability across production.

The biggest challenge in environmental testing is uncertainty.

No lab can perfectly replicate every real-world scenario. Conditions vary by geography, climate, and use case, and emergency situations often introduce variables that are impossible to anticipate.

Instead of trying to predict every outcome, we test to extremes.

“You never really know what they’re going to experience,” Browne explains. “So we test to an extreme level so we’re confident there shouldn’t be problems down the road.”

This mindset continues to shape future investments, including exploration of testing environments that combine multiple stress factors simultaneously, further closing the gap between lab conditions and real-world complexity.

At its core, environmental testing is about eliminating uncertainty before a product ever reaches the field.

It’s about ensuring that exposure to heat, cold, water, vibration, and time doesn’t compromise performance. And it’s about identifying failure points early when they can still be fixed.

“We’d much rather see a failure here than have something fail out in the field,” Browne says.

That philosophy defines the lab’s role. It’s where products are pushed, challenged, and refined, so that when they’re needed most, they perform without hesitation.

Because in unpredictable environments, reliability should never be a question.