Tech
Are bridges near you safe? This MRI-like scan may prevent disaster
Suyun Ham can’t take his eyes off a scanner. “Lower the sensors a little bit more,” Ham urges an assistant. Then a barrage of data floods in, filling computer screens for a diagnosis.
But Ham isn’t a medical doctor. Nor is his “patient” a living creature. An engineering professor from the University of Texas at Arlington, he is experimenting with a novel approach in bridge inspection.
Ham’s mobile-scanning system is part of efforts to make US infrastructure more heat-resilient. Unlike floods and tornados that can quickly destroy bridges, extreme heat is a silent killer that harms them over time, experts say.
“If temperatures are out of range, bridges can get damaged unexpectedly,” says Ham, who lives in the Dallas-Fort Worth area, where summer temperatures can exceed 100F (38C). “With our “MRI,” we can see what’s inside a bridge quickly.”
Bridge materials expand and contract in response to temperature fluctuations. While most are equipped with features to accommodate that movement, they were designed to withstand historically cooler temperatures, says Paul Chinowsky, a professor emeritus of civil engineering at the University of Colorado Boulder.
When temperatures hit a record high, bridges might behave in ways that engineers didn’t intend them to, he adds.Heat-swollen steel joints can impair the mobility of a swing bridge, making it unable to open or close—at least temporarily. Concrete also expands under heat. Once its expansion goes beyond a bridge’s original design limit, the concrete can crack, exposing it to moisture that can corrode internal metal components.
That’s an increasingly common scene around the world. In China, a concrete bridge broke in half because of brutal heat in 2022. That same year, London wrapped Hammersmith Bridge in giant pieces of foil to prevent it from overheating. And when the blistering sun baked Chicago’s DuSable drawbridge in 2018, its steel joints expanded and got stuck until firefighters hosed the bridge with cold water.
“Bridges are very susceptible,” Chinowsky says. “The hotter it gets compared to what typically it is, the more danger you have.”
‘A lot of headaches’
Hotter temperatures are baking US bridges at a time when their health is already deteriorating. The country has more than 600,000 bridges, almost half of which have exceeded their designed lifespan of 50 years, according to a 2025 report by the American Society of Civil Engineers.
With proper maintenance, many can last much longer, potentially exceeding 100 years, the industry group says. Still, about one in three bridges requires repair or replacement, according to an analysis published this year by the American Road and Transportation Builders Association.
Hussam Mahmoud, a professor at Vanderbilt University who has evaluated the structural integrity of about 90,000 steel-girder bridges across the US, found that many have aged prematurely, due in large part to the heat-accelerated malfunction of their expansion joints.
As the frequency and severity of heat waves increase with climate change, expansion joints, which connect two bridge spans, expand more often. That, coupled with the strain caused by debris or dirt accumulated in the joints over time, adds pressure to the structure, elevating the risk for a bridge to crack or buckle, Mahmoud says.
Although those defects don’t put a bridge in immediate danger of collapse, they need to be fixed to avoid further damage, which can be “a lot of headaches,” says Mahmoud.
With more than 4.9 billion trips taken across US bridges on any given day, bridge closures can take a toll on commerce and the economy, Mahmoud says. More damage also means higher maintenance costs. The US is already facing a $373 billion funding gap over the next 10 years to repair bridges properly, according to the American Society of Civil Engineers.Heat-induced damage can also cause bridges to malfunction at a time when the free movement of people is needed the most.
In June, a swing bridge in South Carolina got stuck for hours due to sweltering temperatures and was unable to open for ships to go through, delaying rescue efforts for a fatal boating accident.
Drive-by inspections
For Ham, better bridge monitoring is key. “Just like it is difficult to heal a human patient with stage-four cancer, it’d be too late to repair a bridge when there are a lot of defects,” he says.Ham, who spent a big chunk of his college time inspecting bridges, learned the limitations of the conventional method firsthand. He used to tap the bridge surface with a hammer and listen for hollow sounds that could indicate problems.
That hammer later evolved into more advanced devices, yet the time-consuming nature of manual inspection remains largely unchanged, Ham says. The conventional method also requires a bridge to shut down some of its lanes for inspection, a big ask for places such as Texas, which has 56,000-plus bridges.
While federal mandates typically require highway bridges to be inspected every two years, Ham and others at the University of Texas’s Smart Infrastructure and Testing Laboratory in Arlington want to help increase that frequency by introducing a new solution: a drive-through inspection.
Ham’s machine—a trailer loaded with dozens of electronics—is hauled by a pickup truck. On a sizzling afternoon in July, as the vehicle pulled the machine across a concrete bridge over a stream bed on the university campus, the tools generate mechanical waves that can propagate through concrete.
Sensors pick up the resulting bridge vibration signals, while a GPS device pins down where each signal comes from. Meanwhile, ground-penetrating radars emit pulses to create images of the structure under the bridge’s deck, and GoPros videotape the surface condition. The end goal, according to Ham, is to collect a wide range of data that enables engineers to identify cracks, voids and other anomalies.
The machine scanned the entire 5-feet-long bridge within seconds. By contrast, it would take hours for inspectors to complete the same job using the conventional method, according to Ham.
“There’s a lot of surface damage,” Ham says, pointing to a number of bright orange dots and stripes scattered across the dark blue background of one computer image generated from the onsite scanning. He also spots a cluster of tiny cracks, highlighted by a red rectangle.
Ham and his team then use artificial intelligence to refine the analysis and filter out “noises”—irregular vibration signals caused by a car driving by during the inspection, for instance. The engineers report their findings to bridge overseers for safety assessment and future repair work.
“It is better for time and efficiency,” says Mark Burwell, a bridge inspection coordinator at the Texas Department of Transportation whose agency has deployed Ham’s technology to inspect dozens of bridges since 2019. As inspectors no longer have to work next to moving traffic on a bridge, the automated inspection also helps put humans out of harm’s way, he adds.
For now, Ham’s “portable MRI” is only available for bridge inspection in the Lone Star state. Ham aims to scale up its deployment. To make that happen, the engineers will have to first perfect the innovation.
There have been many learning moments, Ham recalls. Once, a rough ride knocked off sensors, cutting an inspection mission short. (The machine is now equipped with a lift that lowers and raises it to avoid obstacles on the road.) On another occasion, the software grappled with the complexity of decoding signals from a concrete bridge covered with asphalt patches.
To help the AI better interpret signals, Ham and his team have turned their laboratory into a manufacturing hub of artificial defects. There, engineers soak metal sticks in brine to emulate corrosion. They also drill holes in concrete slabs to mimic cracks. By applying sensors and radars to examine those artificial defects, the engineers can pair different signals with different types of damage.
Even so, the machine is unlikely to catch all the heat-induced problems, according to Ham. For instance, searing temperatures can stress a bridge, but the machine can’t detect it until physical damage occurs.
But data collected from damaged bridges may pave a way for future protection, Ham says. That’s because, by comparing the number of cracks in bridges built with different methods and materials, the technology plays a role in helping regulators determine how to design structures more suitable for a hotter world.
“We’re like a medical doctor,” Ham says. “We can help them make a decision.”
2025 Bloomberg News. Distributed by Tribune Content Agency, LLC.
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A new app with a straightforward name wants to make it easier for people to fix their stuff by helping them find trustworthy repair services near them.
The Repair App launched today, on a day that’s being celebrated as International Repair Day. The app is currently available in beta form in the US and France, because that’s where cofounders Robert Lise and Caleb Faruki reside, respectively. If the app does well, more countries should be added soon.
The app arrives during a time of renewed interest in the right to repair movement. Through lobbying efforts and consumer advocacy campaigns, right to repair folks argue that when somebody buys a piece of technology, they should have the legal right to fix it, replace broken parts, or upgrade it using services, tools, and replacement parts accessed on the open market.
“You don’t actually own something if you don’t have the ability to repair it,” says Lise, the app’s cofounder.
It sounds like a position that doesn’t need much advocacy, but large companies like Apple, Samsung, and John Deere, have been resistant to allow their customers to tinker with their products.
Lise says the goal of The Repair App is to platform businesses and service providers who cover just about anything that can be repaired, from devices like phones and computers to bicycles, clothes, and maybe eventually vehicles. To start, they have reached out to verified repair businesses that they can vet for inclusion in the app.
Matt Zieminski, vice president of Repair.org and VP of partnerships at the repair marketplace iFixit, has worked with Lise and the others on the Repair App and says he supports the project. He says that if the app is utilized by enough people, it could make finding options for fixing your stuff easier than it is now.
For example, if you’re searching for repair options on Google, Zieminski says, your local community repair shops might not necessarily come up as one of the top results. Instead, you’re presented with big repair franchises or generic service providers.
The Repair App will instead show you the shops closest to you that have been vetted by the tech repair experts behind the app.
“I think this is really cool,” Zieminski says. ”It is going to level that playing field and allow everybody to find the services they need and then to offer the services to people that may not even know those services exist.”
Linking customers to businesses is certainly not a new service. (Remember phonebooks?) Sites like Thumbtack or Angi (formerly Angie’s List) have long acted as repositories for finding handypeople to hire for a variety of tasks. Places like Upwork and Fiverr put a gig economy spin on the same format. And there are more specific service finder sites like RepairPal, a resource for car repair shops. (RepairPal was bought by Yelp last year.)
As much as the Mini felt very comfortable and good inside, once I started exploring vibration modes, I began to fear exactly how secure the whole thing was. Based on the wiggling feeling I was experiencing, I had concerns. What if I used too much lube, got excessively wet on my own in addition to the already-applied lube, or sneezed? Will the Lush Mini fly out? None of these things happened when I tried the Mini, but you can feel the smaller size, and it’s hard not to imagine it falling out on its own.
If I were to let my partner control the Mini via the Lovenese app while we were out on the town, I’d better be rocking a very snug pair of full-coverage granny panties. This is far from a tragedy, as outdoor sexual adventures aren’t a requirement for me. But it’s important for internal products to feel secure and safe for me to relax and have an orgasm.
Although I find the greatest pleasure from clitoral stimulation, I do love a strong G-spot vibration—especially when the two are working together. After all, you never know when a blended orgasm might come your way. The spectrum of intensities for the external arm is definitely enough for me, so much so that I didn’t need to click my way up to the most powerful setting, but the inside vibrations are subpar.
According to Lovense’s site and manual, both the Mini and Lush 4 deliver up to 7,000 vibrations a minute and unlimited patterns via the app. The vibration intensity I was experiencing internally was most likely linked to the size of the egg. Despite it being smaller, ever-so-slightly, it wasn’t covering enough area against my G-spot, and I could feel that.
Solo or Couples Play
Courtesy of Lovense
Like every Lovense Lush model, the Lush Mini is waterproof and has a long battery life. It takes only 40 minutes to fully charge, and you get close to four hours of playtime, depending on how much you crank up the modes. Should things go south mid-romp, you can get another hour of use from a quick seven-minute charge. I strongly feel all sex toys should include a fast-charging option like this.
It’s a fun couples toy as much as it’s an interesting solo toy. But if you’re experienced in the Lovense Lush line or similar toys during partnered play, you may want to skip the Mini for the larger Lush 4 (which costs around the same). If you’re new to this arena, however, then the Mini is likely to be a good fit for you. Beginners, this baby is for you.
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Need Something Repaired? Now There’s an App for That
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