New Survey Maps Roadless Areas Of U.S.

Researchers have surveyed the continental U.S. to create a map of all roadless areas. The survey revealed that a road is always within 22 miles of any point in the country, and that some areas have too many roads for the size of their populations.

1 minute read

May 5, 2007, 5:00 AM PDT

By Nate Berg


"In the continental United States, roads are never more than a reassuring 22 miles away. Their ubiquity makes travel and transport convenient for people, but it can also fragment or destroy wildlife habitats, help introduce invasive species, and contribute to pollution."

"The further an environment is from a road, the less it is affected by those things. But traditional tools for analyzing roadless space have ranked a plot of land one mile from a road the same as one several miles from a road."

"Researchers compiled roadless space data in 100-foot intervals, county-by-county, across the 48 contiguous United States."

"And when the scientists compared the roadless space with the number of people in a given area, they sometimes found a mismatch: that is, too many roads for too few people."

Thursday, May 3, 2007 in Discovery News

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 11, 2025 - Diana Ionescu

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

Yellow single-seat Japanese electric vehicle drivign down road.

The Tiny, Adorable $7,000 Car Turning Japan Onto EVs

The single seat Mibot charges from a regular plug as quickly as an iPad, and is about half the price of an average EV.

June 6, 2025 - PC Magazine

Rendering of autonomous cargo train moving across bridge across river in wooded area between Texas and Mexico.

Trump Approves Futuristic Automated Texas-Mexico Cargo Corridor

The project could remove tens of thousands of commercial trucks from roadways.

June 17 - FreightWaves

Rendering of white three-story single-stair building in Austin, Texas with staircase in the middle.

Austin's First Single Stair Apartment Building is Officially Underway

Eliminating the requirement for two staircases in multi-story residential buildings lets developers use smaller lots and more flexible designs to create denser housing.

June 17 - Building Design & Construction

MARTA bus with Atlanta skyline in background

Atlanta Bus System Redesign Will Nearly Triple Access

MARTA's Next Gen Bus Network will retool over 100 bus routes, expand frequent service.

June 17 - Mass Transit