Skip to Content
Streetsblog USA home
Streetsblog USA home
Log In
Virginia Department of Transportation installed these zig zag pavement markings to caution drivers about the potential for pedestrians and cyclists by a popular trail crossing. Photo: Virginia Department of Transportation
Virginia DOT installed these zig zag markings to caution drivers approaching the intersection of a popular walking and biking trail. Photo: Virginia DOT
Virginia Department of Transportation installed these zig zag pavement markings to caution drivers about the potential for pedestrians and cyclists by a popular trail crossing. Photo: Virginia Department of Transportation

At 11 points in northern Virginia, the familiar straight dashed lines on the road gives way to a series of zig zags. The unusual markings, the result of a pilot project from the Virginia Department of Transportation, are meant to alert drivers to be cautious where the Washington and Old Dominion (W&OD) Trail intersects with the road -- and bicyclists and pedestrians frequently cross.

After a year-long study of this striping treatment, Virginia DOT officials say the markings are effective and should become part of the Manual on Uniform Traffic Control Devices -- the playbook for American street designers.

This photo shows another style of zig zag pavement marking tested in Virginia. Photo: VDOT
This photo shows another style of zig zag pavement marking tested in Virginia. Photo: VDOT
This photo shows another style of zig zag pavement marking tested in Virginia. Photo: VDOT

VDOT found the zig zag markings slowed average vehicle speeds, increased motorist awareness of pedestrians and cyclists, and increased the likelihood that drivers would yield. They also noted that the effects of the design change didn't wear off once motorists became used to the it -- they still slowed down a year after installation.

VDOT says the results indicate that zig zag markings are a more cost-effective solution for conflict points between trails and high-speed roads than the current treatments: flashing beacons placed above the road or off to the side.

The zig zag concept was imported from Europe. It is currently used in only two other locations in North America: Hawaii and Ottawa, Ontario. It was one of more than a dozen European traffic management techniques VDOT zeroed in on to test locally.

The zig zag markings reduced motorist speeds approaching the trail at Belmont Ridge Road, according to a VDOT study. The effect was long lasting.
The zig zag markings reduced motorist speeds approaching the trail at Sterling Road by about 5 mph, according to VDOT. The effect remained strong over time.
The zig zag markings reduced motorist speeds approaching the trail at Belmont Ridge Road, according to a VDOT study. The effect was long lasting.

The W&OD trail is a popular route for both recreation and commuting in the D.C. metro area. Between 2002 and 2008, there were 21 collisions involving cyclists and two involving pedestrians along the trail, which intersects with major roads at 70 points along its 45-mile path in Fairfax and Loudoun counties in Virginia.

The effect of the zig zag markings was measured using speed radars over the course of a year. Feedback from motorists, cyclists, and pedestrians was also collected using online surveys. While the survey did not come from a random sample, 65 percent of drivers said they were more aware because of the markings and 48 percent said they liked them. The zig zags were also popular with cyclists; 71 percent said the markings affected driver behavior.

Said one respondent: "Drivers rarely stopped before the markings were installed. Since installation, they stop much more often."

Stay in touch

Sign up for our free newsletter

More from Streetsblog USA

Talking Headways Podcast: The Powerless Brokers

Colin Parent of Circulate San Diego on why California can't build transit.

August 15, 2025

Friday’s Free-Range Headlines

Bad drivers and giant trucks are ruining our children's childhoods, and more parents are speaking out.

August 15, 2025

‘A Tombstone’: Abandoned Bicycles Outside Federal Courthouse Are a Symbol of U.S. War on Immigrants

At least four bicycles and one moped are chained up and seemingly abandoned outside NYC's federal courthouse. They are symbols of America's war on immigrants.

August 15, 2025

Friday Video: The Ingredients of a Truly Great Street

This short film offers a recipe for a great right of way, and a wealth of inspiration for communities to design for people.

August 15, 2025

No, Washington Post, Driver’s Ed Isn’t The ‘Main Cause’ of Our Road Violence Crisis

A recent Washington Post article blamed bad driver's ed for America's dismal roadway safety stats — and gets a lot of facts wildly wrong.

August 14, 2025

Thursday’s Headlines Cross That Bridge

But you shouldn't have to if you're on foot. Plus, Amtrak's 2021 expansion plan faces grim prospects under President Trump.

August 14, 2025
See all posts