Quick Verdict
Road diet striping reconfigures a road to fewer travel lanes, most commonly converting a four-lane undivided road into two through lanes plus a shared center turn lane, often adding bike lanes with the leftover width. It is a restriping project, not a reconstruction: the old lines come up and a new layout goes down. The classic four-to-three conversion typically cuts crashes and calms speeds while carrying similar traffic volumes. Costs are driven by removal, new long-line striping, and traffic control. In Oregon, plan the work into the dry-season window and follow MUTCD and ODOT spec 00850 for the new marking pattern.
What is a road diet?
A road diet reallocates pavement. A common example takes a four-lane undivided road -- two lanes each way, with left-turners stopping in the through lane -- and restripes it as one through lane each way plus a center two-way left-turn lane. The width you free up can become bike lanes, wider shoulders, or on-street parking.
The point is safety and function. Pulling left-turning cars out of the through lane removes a major crash type, and narrowing the visual field tends to calm speeds. For the right road -- moderate volume, lots of driveways and turns -- it is one of the highest-return striping treatments available.
How road diet restriping works, step by step
A road diet is mostly a striping and removal sequence. The pavement usually stays; the lines change.
- Confirm the new layout against MUTCD and ODOT 00850 lane and marking widths.
- Remove the existing lane lines so no ghost fights the new pattern.
- Repair or sealcoat the surface if needed, before new paint goes down.
- Lay out and stripe the new through lanes, center turn lane, and any bike lanes.
- Add arrows, legends, bike symbols, and crossings.
- Verify retroreflectivity and spacing under traffic conditions.
- Removal is the make-or-break step; a lingering ghost line on a public road is a real liability.
- The new center lane follows the paired solid-and-dashed yellow pattern of a proper TWLTL.
- Bike lanes and buffers use their own widths and symbols per spec.
Costs and materials for a road diet
A road diet's cost is the sum of removal, new long-line striping, symbols and legends, and traffic control. Material choice -- paint versus thermoplastic -- drives both up-front cost and how often you restripe.
| Cost component | Baseline range |
|---|---|
| Line/marking removal | $0.50 -- $3+ per lin ft |
| Long-line striping (paint) | $0.15 -- $0.60+ per lin ft |
| Long-line striping (thermoplastic) | $0.60 -- $2.50+ per lin ft |
| Arrows / legends (paint) | $15 -- $60+ each |
| Bike symbols / legends (thermo) | $50 -- $150+ each |
| Mobilization | $150 -- $600+ flat |
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
Road diets almost always run on public-facing corridors, which means night work, flaggers, and traffic control that can rival the striping cost. Thermoplastic costs 2 to 4 times paint but survives more Oregon winters between restripes -- a real lifecycle argument on a corridor that is expensive to close. Removal of the old four-lane pattern is a bigger share of the budget than owners expect.
Oregon planning for lane reductions
Timing rules everything. Paint needs dry, warm pavement, so the roughly May through October window is when this work happens. A road diet striped into fall rain will not bond, and redoing a corridor is costly. East of the Cascades, freeze-thaw stresses the surface, so any repair should happen before the new lines go down.
The new center lane is a textbook center turn lane marking job -- get the paired yellow pattern to spec. Before any of it, the old four-lane pattern needs proper road striping removal so ghosts do not confuse drivers. Sequencing all of this into one plan, the way we approach road striping and line painting in Oregon, keeps the corridor closed for the shortest time.
Is your road a good candidate for a diet?
Not every road benefits from a diet, and putting one on the wrong corridor causes congestion instead of curing crashes. The classic candidate is a four-lane undivided road carrying moderate daily traffic with lots of driveways, businesses, and left-turn movements -- the exact conditions where left-turners stopping in the through lane cause rear-end crashes. On that road, a center turn lane removes the problem while the two remaining through lanes still carry the volume.
The poor candidate is a high-volume arterial already near capacity, where dropping a through lane each way would back traffic up badly. Between those extremes, the decision comes down to the traffic study: how many vehicles per day, how many turning movements, and what the crash history looks like. A road diet is a data-driven decision, not a striping preference.
There are secondary benefits worth weighing. The width freed up can become bike lanes or wider shoulders, improving comfort for cyclists and giving stalled vehicles somewhere to go. The narrower visual field of a three-lane section tends to calm speeds, which matters near schools, parks, and commercial frontages where people are crossing on foot.
The reversibility is a quiet advantage too. Because a road diet is a striping change rather than reconstruction, a corridor can be tested and, if the data does not support it, restriped back. That lower commitment makes it easier to try on a marginal candidate than a project that moves curbs and pours concrete.
Maintenance planning belongs in the decision from the start. A road diet's new center turn lane and bike lanes carry concentrated wear, and the markings will need refreshing on a cycle to keep doing their safety job. Building that repaint interval into the plan -- and choosing thermoplastic where traffic justifies it -- means the corridor keeps the crash-reduction benefit that made the diet worthwhile, rather than sliding back toward confusion as the lines fade. A road diet is only as good as the markings that define it, so treating those markings as ongoing infrastructure is part of doing it right.
The Bottom Line
A road diet is a striping project with outsized safety returns when it fits the road: remove the old pattern, stripe the new one to spec, and choose 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 scope a lane reduction end to end.