Quick Verdict
Center turn lane marking creates a two-way left-turn lane (TWLTL): a shared middle lane bordered by a solid yellow line on the outside and a dashed yellow line on the inside, on both sides. Drivers from either direction use it only to turn left or wait to merge. The marking pattern is defined by MUTCD and adopted by ODOT under spec 00850. Line widths are typically 4 inches, dashed segments follow a set stripe-to-gap ratio, and the lane is often marked with left-turn arrows. Done right, a TWLTL cuts rear-end crashes on busy commercial corridors.
What is a two-way left-turn lane?
A TWLTL is the center lane you see on many Oregon arterials -- think a busy stretch of highway through a small town lined with driveways and businesses. Both directions of traffic share it, but only for turning left or for a driver leaving a driveway to pause before merging. It is never a passing lane or a through lane.
The value is safety. Instead of left-turning cars stopping in the through lane and getting rear-ended, they pull into the center. On corridors with lots of driveways, a well-marked center turn lane is one of the highest-return striping treatments there is.
How is center turn lane marking striped?
The defining feature is the paired yellow line on each edge of the lane: a solid yellow on the outside (facing the adjacent through lane) and a dashed yellow on the inside (facing the shared center). The solid line tells through traffic not to cross except to turn; the dashed line tells turning traffic they may enter.
| Element | Typical spec | Notes |
|---|---|---|
| Line width | 4-inch | Standard for centerline markings |
| Outer line | Solid yellow | Separates TWLTL from through lane |
| Inner line | Dashed yellow | Allows entry for left turns |
| Left-turn arrows | Paint or thermoplastic | Placed periodically along the lane |
| Lane width | Commonly 10 to 14 feet | Set by the road design |
- The dashed pattern follows a consistent stripe-to-gap ratio so it reads clearly at speed.
- Left-turn arrows and the word "ONLY" or turn legends are added where the design calls for them.
- On higher-traffic corridors, thermoplastic and glass beads boost nighttime retroreflectivity.
Paint or thermoplastic for a TWLTL?
Because center turn lanes sit on busy roads and see constant tire wear at the lane edges, material choice matters. Paint is cheaper up front and fine for lower-volume streets. Thermoplastic costs 2 to 4 times more but lasts far longer and holds glass beads better, which is a real advantage on a corridor that gets Oregon's winter rain and low-angle sun.
Industry Baseline Range: long-line paint striping runs $0.15 -- $0.60+ per linear foot, while long-line thermoplastic runs $0.60 -- $2.50+ per linear foot. Left-turn arrows and legends run $15 -- $60+ each in paint or $50 -- $150+ each in thermoplastic.
These are industry baseline ranges for planning only -- actual pricing depends on surface condition, layout complexity, material (paint vs thermoplastic), line footage, night/traffic-control needs, and current market conditions. Get a site-specific quote.
Current Market Reality
A TWLTL on a state-adjacent or high-traffic road usually means night work and traffic control, both of which raise the real number well above the base per-foot rate. Frame thermoplastic as lifecycle cost: it survives more winters between restripes, which matters on a lane that is expensive to close and re-stripe each time.
Oregon considerations for center turn lanes
Timing is everything in Oregon. Paint needs dry pavement and warm enough temperatures to cure, which puts most striping in the roughly May through October window. A TWLTL laid down in November rain will not bond well. On roads adopted to MUTCD and ODOT 00850, the pattern is not a suggestion -- get the widths, colors, and spacing right or the marking fails inspection.
If a corridor is being reconfigured from four lanes to three with a center turn lane, that is a classic road diet restriping project, and the old lane lines must come up first via proper road striping removal. Bundling all of it into one plan, as we lay out in our guide to road striping and line painting in Oregon, keeps the corridor closed for the least time.
Common TWLTL mistakes to avoid
A center turn lane only works when it is unambiguous, and a few recurring errors undo that. The most common is reversing the solid and dashed lines -- putting the dashed line on the outside where it invites through traffic to drift in. That single mistake turns a safety treatment into a hazard, because drivers no longer know where the shared lane begins.
Another frequent problem is inadequate left-turn arrows or missing "ONLY" legends, which leaves drivers unsure whether the lane is shared or a dedicated turn pocket at a specific intersection. Spacing the arrows too far apart has the same effect on a long corridor: a driver entering mid-block sees no cue and may treat the lane as a passing lane.
Line width and retroreflectivity matter too. A center turn lane striped with thin, worn, or bead-poor paint disappears in the rain and dark that define much of the Oregon year, exactly when clear guidance matters most. On a busy commercial corridor, that is a strong argument for keeping the lane on a maintenance cycle rather than letting it fade to the point drivers guess.
Finally, skipping proper removal of an old lane pattern before laying the TWLTL leaves ghost lines that compete with the new markings. On a public-facing road, two sets of lines fighting for attention is both confusing and a liability, which is why removal and restriping belong in the same plan.
Maintenance is the quiet factor that decides whether a good TWLTL stays good. Even a correctly striped center turn lane fades under traffic, and the paired solid-and-dashed pattern only works while both lines and the turn arrows read clearly. On a busy Oregon corridor that carries winter rain and low sun, that argues for scheduling a repaint cycle before the markings degrade rather than waiting until drivers start guessing where the shared lane begins. Treating the lane as recurring infrastructure, refreshed on a plan, keeps its safety benefit intact year after year.
The Bottom Line
A two-way left-turn lane is a proven safety treatment, but only when the paired solid-and-dashed yellow pattern is striped to spec with the right material for the traffic load. Cojo Excavation and Asphalt is CCB licensed and insured, based in Hood River, serving statewide Oregon and the I-5 corridor. Explore our striping services or request a free estimate to plan a center turn lane that reads clearly day and night.