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Obstacle Marking Programmes: Stakes, Flags and Hazard Maps That Prevent Edge Strikes

Every winter the same manhole, valve box or curb end gets hit because nobody marked it.

Illustration for obstacle marking plow stakes flags: a bolt, a clock and a data table
4 answersAsked 30 October 2026·Operating Practice in the Field

SENTHAI Editorial Team

TALK / FIELD OPERATIONS DISCUSSION
Buyer question

Every winter the same manhole covers, valve boxes and curb ends get hit because nothing marks them. How do we set up an annual marking programme with stakes, flags and a hazard map?

Scenario: every winter the same manhole, valve box or curb end gets hit because nobody marked it. Direct answer: mark hazards in autumn, show them on a one-page map and review them every year, with a named owner. A marked and mapped hazard is much less likely to meet an edge. This is a template for a programme, not a standard.

Template: the marking programme

Step What to do Owner When
1. Survey Walk or drive each route in daylight; list raised covers, valve boxes, curb ends, bollards, speed devices and uneven joints Supervisor and a driver Early autumn
2. Record Photograph each hazard, note a landmark and its location Surveyor Same visit
3. Mark Place stakes or flags, with reflective tops where visibility is poor Crew Before first snow
4. Map Put the hazards on a one-page map per route Dispatcher Before first snow
5. Brief Show the map to every driver, including relief drivers Supervisor Preseason briefing
6. Update Add any hazard found or struck; replace lost stakes Any driver; supervisor approves During season
7. Review Compare strikes with the map; remove, move or add markers Team After season

Choosing markers

Markers only work if they survive the snow they are meant to sit above.

  • Use markers tall enough to show above the expected snow, and bright enough to see in poor light.
  • Use a consistent colour code, for example one colour for covers and another for curb ends, so that drivers learn it.
  • Check with the owner of the property or road before placing stakes. Some places have rules.

What can go wrong

Marking works until it does not, and the failure modes are predictable.

  • Stakes knocked down by plows or residents. A downed stake is worse than none, because the map still shows it.
  • Maps go out of date. A map without a review date is a liability rather than an aid.
  • New drivers do not see the map. A map nobody is briefed on is decoration.

Limits

Markers help, but they do not replace slowing down and lifting. Where a hazard is too serious to avoid, talk to the owner about repair.

A one-page map

A good map shows each hazard as a numbered dot with a short label and a landmark. Print it in colour, laminate it and put a copy in every truck. Keep the digital file with the date of the last review.

Boundary: No marking standard or rule is cited; check with property and road owners before placing markers.

↳ Replying to SENTHAI Editorial Team

Do the survey with a driver who knows the route and one who does not. The newcomer sees what the veteran has stopped noticing. Photograph from the driver’s seat height, since that is the view in a storm. After the first storm, walk the worst spots and note which markers survived and which were hit.

↳ Replying to Field-check perspective

Cross-check the strike log with the hazard map: every strike at an unmarked place becomes a new marker, and every strike at a marked place needs a conversation about why. Keep a stock of stakes and flags and a record of replacements. Report repeated strike locations to the owner so that repairs can be considered.

↳ Replying to Maintenance perspective

Stakes and flags are cheap compared with a bent edge and a day of repair. Estimate what strikes cost you per season from your records and compare with the cost of markers and the time to place them. Buy in bulk before the season, and keep a few reflective items for the worst sites.

Next step

Scenario: every winter the same manhole, valve box or curb end gets hit because nobody marked it.

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