Scenario: a road agency repaints lane lines each year and sees them damaged by winter plowing. Direct answer: the public comments suggest flexible designs were sometimes chosen to reduce damage to markings, but they are opinions, not tests. Settings and timing also matter. I cite only the Clear Roads feedback document, with product names left out.
What state comments mention
| Agency and period | Comment (paraphrased) |
|---|---|
| Ohio DOT (2007-2008) | Said lane striping and crack-sealing material was not “peeled” from the road with a flexible blade as it was with steel blades, with less wear on lane lines |
| West Virginia DOT (2012-2013) | Reported good cleaning around raised pavement markers with a flexible tooth-style blade |
| Iowa DOT (2016-2017) | Tested power float valves, hoping to reduce weight on the front plow and increase blade life; operators said it worked better in light fluffy snow and drifts and that the control layout needed improvement |
Levers a crew can use
The levers are set-up choices, and they are cheaper than repainting.
- Edge type. Flexible or segmented edges may follow the surface more closely. Trial one.
- Float or down pressure. Lighter contact may be gentler on markings where equipment allows it. The Iowa comment is one example of agencies trying it.
- Timing. Plow before snow compacts where possible, so less force is needed.
- Speed. Slower passes over markings.
- Marking type and age. Fresh paint and thermoplastic behave differently; ask the marking contractor.
How to trial
Marking damage is easy to argue about and hard to prove, so build the evidence before the season.
- Photograph a stretch of lane line before the season. Include a reference object for scale.
- Plow it with the trial set-up and a control section with the usual one. A control section is what makes the comparison mean something.
- Photograph again after several storms and compare. One pass proves nothing; a season of passes is evidence.
What to avoid
Do not promise a client that markings will be unaffected. State what you will do to limit damage.
Reading the Iowa float comment carefully
The Iowa note says the float valves were installed on trucks also used for blade testing, with the goals of reducing weight on the front plow and increasing blade life, and that operators were unsure how much extra life was achieved. That honesty is useful: it shows that agencies try settings and equipment without always knowing the effect, and that a trial design should include a way to measure what you care about.
Boundary: state comments are operator feedback, not controlled tests. No claim is made that any design protects markings.
Sources and further reading. External references are dated; where a figure is quoted, the link shows where it came from.
Clear Roads Product Experience Feedback 2006-2021: Combined Results, Blades and Plows (Covers state feedback 2006-2021; accessed 2026-10-24) ↗What should we do when the packing list and blade markings show different lot numbers? ↗Carbide vs Steel Blades: The Cost-per-Lane-Kilometre Calculation ↗JOMA style rubber-flex blade ↗Ice Storm Aftermath: Plowing Through Branch Debris and Edge Damage Risks ↗Chloride and Smart Salting: What Minnesota’s Training Covers and How Plowing Fits ↗Frost Heaves and Potholes: Edge Damage Hot-Spots and How Crews Adapt ↗
