Street works · England
O1 — Signing, Lighting & Guarding
Setting out a works site so traffic and pedestrians stay safe: the survey and risk assessment before you start, safety zones and layout, provision for pedestrians and vulnerable users, and the forms of traffic control.
Who holds this certificate
Operatives. O1 is a key certificate — every other O unit depends on it.
What it covers
5 topics, 140 questions between them.
Duties, Survey & Risk Assessment
25 questions
Site Layout & Safety Zones
35 questions · 5 with a diagram
Pedestrians & Vulnerable Users
25 questions · 3 with a diagram
Setting Out & Equipment
20 questions · 1 with a diagram
Traffic Control
35 questions · 5 with a diagram
Find It in the Red Book
Open-book questions are not really memory tests — they test whether you can find the right page quickly. These 10 drills give you a heading and ask which document and section it sits under, so looking things up under time pressure becomes automatic.
Try 3 drills freeThe theory test
O1 is assessed by a theory test of 20 multiple-choice questions in 45 minutes. You need 16 out of 20 to pass. The app draws a fresh mock from this certificate's own bank each time and marks it against that pass mark.
Format described as published at the time of writing — confirm it with your assessment centre before you sit the test.
Written against
Every O1 question cites one of these, and the explanation names the clause or paragraph so you can check it yourself.
- Safety at Street Works and Road Works (the Red Book)
- DfT qualifications guidance
- New Roads and Street Works Act 1991
- The Street Works (Qualifications of Supervisors and Operatives) Regulations
NRSWA Street Works Revision is independent revision material. It is not affiliated with, endorsed by or approved by HAUC(UK), SWQR, any awarding organisation or the Department for Transport, and it does not award a qualification or a card.