WARREN, Mich. -
Though it's only in the research stage, the technology soon will be more useful than ever. The number of those 65 and older in the United States will nearly double in about 20 years, meaning more people will be struggling to see the road as they used to.
GM's new windshield won't improve their vision, but it will make objects stand out that could otherwise go unnoticed by an aging eye.
At the same time, the developers say, the technology won't cause drivers to plow into trees. It is enhancing just a few objects that are already in a driver's view, not splashing distracting information onto the glass.
For example, during a foggy drive, a laser projects a blue line onto the windshield that follows the edge of the road. Or if infrared sensors detect a person or an animal in the driver's path at night, its outline is projected on the windshield to highlight its location.
It's possible because of a transparent coating on the windshield that lights up when struck by ultraviolet light.
Of course, much more goes into it than that. Sensors have to determine the position of the car in relation to the road, while other devices track the driver's head and eye movements to make sure the image on the windshield isn't skewed. The technological issues mean it probably will be a while before the view through the windshield of a Buick looks like a pilot's head-up display in an F-16.
"You can see the difficulty of implementing technology like this," GM researcher Thomas Seder said recently.
It's also been a bit of a struggle to get skeptics to see how helpful the windshield could be, he said.
"They say, 'That would be very frustrating or confusing, to have things on my windshield. I need to see the world,' " Seder said. "I'm enhancing the world. I'll take a feature that should be important to you, like the edge of the road, and paint a line over the real edge."
The windshield is designed specifically for older drivers, who have vision problems at a much higher rate than other age groups. Currently, 12.4 percent of the population is 65 or older, but by 2030, that percentage is projected to jump to 20 percent, or 71.5 million people, according to the Census Bureau.