Why Do Some Speed Limit Signs Have Flashing Yellow Lights?






There are speed limit signs of all shapes and sizes out there, but only some have flashing yellow lights. At first glance, that may sound counterintuitive, given that any flashing could distract the driver. However, capturing drivers’ attention is exactly the goal of these signs. Whenever a speed limit sign has flashing yellow lights, that means there’s an unexpected hazard nearby, such as road construction or heavy pedestrian traffic.

These signs temporarily override the current speed limit in the area and are usually only active during certain conditions. You’ll most likely find speed limit signs with flashing yellow lights near a school. Depending on the jurisdiction, the flashing may only be active during school hours or when children are present. However, this isn’t always the case, and the bottom line is that if the sign is flashing, you must obey the current speed limit or risk a fine. This is particularly true if you find yourself in a U.S. state where it’s easy to get a speeding ticket.

Yellow is easily noticeable

Yellow has been standardized as a universal symbol for caution even outside of speed limits, because of science. The color sits at a medium wavelength of around 580nm in the visible spectrum. This means our eyes can perceive it more easily than most other colors (which is why school buses are yellow), with red sitting at the top of the spectrum. An Iowa State University study showed that “under normal lighting conditions, the eye is most sensitive to a yellowish-green color.”

In addition, the Federal Highway Administration ran a test, showing that colorful warning signs that were colored yellow and fluorescent yellow-green were easier to spot at wider angles compared to the standard black and white signs, especially in urban areas. The same agency also published guidelines on speed limit signs with flashing yellow lights. Namely, 50 and 60 flashes per minute, and each flash should stay on for at least half to two-thirds of the full cycle.





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Today, when one pictures a “classic Dodge Charger”, the first image that pops up is almost certainly one of the highly desirable Charger models from the late 1960s or early ’70s. Indeed, those early muscle car Chargers are iconic, playing a starring role in the “Dukes of Hazzard” television show and, somewhat more recently, “The Fast and the Furious” films. But as time ticks on, is it time to start appreciating the modern version of the Charger as a potential modern classic?

It’s now been over 20 years since Dodge brought back the Charger nameplate for a spacious four-door sedan with an optional HEMI V8 engine. While the basic Charger R/T was a potent machine for its time, Dodge really took the Charger’s game to the next level for the 2006 model year with the debut of the Charger SRT8. 

The SRT8 model used a larger version of the third-gen HEMI V8 that, combined with other performance upgrades, transformed the sedan into a serious performance car capable of running with its 1960s HEMI ancestors at the drag strip — to say nothing of its vastly superior handling and refinement. In the years that followed, Dodge would continue to improve the Charger’s performance with larger and more powerful HEMI engines, but the significance of the original Charger SRT8 is not to be overlooked.

A muscle car legend reborn for the 2000s

Today, with the modern Charger being such an established part of the car enthusiast world, it’s easy to forget some of the controversy that surrounded its mid-2000s return. Most of it focused on the fact that the beloved muscle car nameplate had been brought back for a four-door sedan rather than a retro-styled coupe. Fortunately, those people looking for that retro coupe would be satisfied by the reborn Dodge Challenger when it arrived a few years later, while the Charger went on to become a highly popular muscle sedan in its own right.

The addition of the SRT8 model to the lineup certainly helped, of course. Under the hood was the larger 6.1-liter HEMI V8, which differed from the standard 5.7-liter HEMI in several ways, not least the displacement. With the 6.1 under the hood, the SRT8 made 425 hp and 420 lb-ft of torque, easily laying down a mid-13-second quarter-mile time in Motor Trend’s hands. This was very quick by mid-2000s standards, especially considering the now-outdated five-speed automatic transmission.

But the SRT8’s performance went beyond just the drag strip. As part of the SRT transformation, Dodge also gave the car larger wheels and tires, a retuned suspension setup, and large Brembo brakes. While this didn’t necessarily make the car an agile road course weapon, it did give the SRT8 an athleticism that belied the Charger’s weight and size. 

The evolution of modern Dodge muscle

What’s even cooler about this era in Chrysler/Dodge performance history is that the Charger was just one of the four-door LX platform cars that the automaker offered with SRT badges and a powerful HEMI engine under the hood. Apart from the Charger, buyers could also choose from the more upscale, but ultimately short-lived SRT version of the Chrysler 300C sedan or the Dodge Magnum SRT8 station wagon.

The original Charger SRT8 marked the beginning of a long run of increasingly powerful, high-performance models. In the early 2010s, the Charger SRT8’s 6.1 HEMI was replaced by the larger and more powerful 6.4/392 HEMI, with that motor eventually becoming available in the less expensive Charger R/T Scat Pack. Then, of course, came the Charger SRT Hellcat, with a 707-hp, supercharged 6.2-liter that turned the car into a genuine super sedan.

So is the original Charger SRT8 a guaranteed future classic? Classified listings show that clean examples still bring decent money today, but the fact that it was followed by improved models may ultimately limit its potential for becoming a true, mega-desirable collector car. Regardless, though, the Charger SRT8’s accomplishments in modern muscle car history are not to be taken lightly.





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