Safety on the B exam: the site, the road and the environment
15% of the B exam, in three parts: keeping people from falling or being buried, keeping traffic away from the work, and handling lead, asbestos, stormwater and debris.
The Law and Business exam has a Safety section too, and it is about the employer: the written program, reporting deadlines, records. That page is here. The B Safety section is about the work itself. Some topics, such as trenches, turn up in both; learn the numbers once.
What CSLB says it covers
- Personnel safety — guardrails, openings, fall protection, ladders, scaffolds, excavations.
- Transportation and traffic control — haul vehicles, work zones on public roads, tapers and devices.
- Environmental safety — lead paint, asbestos, stormwater, construction waste.
The numbers that get asked
| Rule | Number |
|---|---|
| Guardrail top rail height T8 §1620 | 42–45 in |
| Personal fall protection on beams, trusses or plates, where guardrails are impracticable T8 §1669 | over 15 ft |
| Extension ladder: foot out from the top support T8 §3276 | ¼ of working length |
| Maximum trench slopes (H:V), Type A / B / C soil, under 20 ft deep T8 §1541.1, Appendix B | ¾:1 / 1:1 / 1½:1 |
| Automatic back-up alarm on haul vehicles of T8 §1592 | 2½ cu yd or more |
| Merging taper length, 45 mph or more / 40 mph or less California MUTCD, Part 6 | L = W × S / L = W × S² ÷ 60 |
| EPA lead renovation rule covers housing built before 40 CFR 745 subpart E | 1978 |
| Lead “minor repair”: painted surface disturbed, per room inside / outside 40 CFR 745.83 | 6 sq ft / 20 sq ft |
| Asbestos NESHAP full rules: regulated asbestos on pipes / other components 40 CFR 61.145 | 260 lin ft / 160 sq ft |
| Construction stormwater permit (CGP) needed when soil disturbed is State Water Board CGP FAQ | 1 acre or more |
| Construction and demolition waste recycled or salvaged CALGreen, via CalRecycle | 65% min |
T8 = California Code of Regulations, Title 8 (Cal/OSHA). MUTCD formulas are the same in the 2014 edition the study guide lists and in the 2026 edition. Checked 29 September 2026.
Where people lose points
- Pick the taper formula by speed. At 45 mph or more, L = W × S. At 40 mph or less, L = W × S² ÷ 60. W is the offset width in feet, S the speed in mph. Using the wrong one is the whole trap.
- Slopes are horizontal to vertical. 1½:1 in Type C soil means 1½ feet back for every foot down. The weaker the soil, the flatter the slope.
- Ladder angle is a ratio of the working length. One foot out for every four feet of ladder from the foot to the top support.
- “Pre-1978” is about when the home was built, not when it was last painted. And window replacement is never a “minor repair,” whatever the area.
- One acre counts the whole plan. A lot under an acre still needs stormwater coverage if it is part of a larger common plan of development that disturbs an acre or more.
How the questions tend to read
A site condition, a speed, a soil type or a building date, and one rule to apply. Two examples of our own (not actual exam questions):
You close one 12-ft lane on a road posted at 55 mph. What is the minimum merging taper length?
660 ft. At 45 mph or more, L = W × S = 12 × 55. The trap is 605 ft, from the low-speed formula 12 × 55² ÷ 60.
You slope the sides of an 8-ft-deep excavation in Type C soil instead of shoring it. How far back from the bottom edge must each side reach at the top?
12 ft. The maximum slope in Type C is 1½:1, so 1½ × 8 = 12 ft horizontally on each side. 8 ft would be the Type B answer (1:1).
How to study it
- Sort by the three headings. Personnel, traffic, environment. Most people only study the first.
- Do the taper math five times. Low speed and high speed, until choosing the formula is automatic.
- Read the Title 8 sections above. DIR publishes each free; most are a page or two. The Law and Business Safety page covers reporting, meetings and heat.
- Budget. About 2½ hours in two weeks and 4 in four (B study plan).
Common questions
What does the Safety section of the B exam cover?
Personnel safety, transportation and traffic control, and environmental safety: about 15% of the exam.
How is a traffic taper length calculated?
L = W × S at 45 mph or more; L = W × S² ÷ 60 at 40 mph or less (W = offset in feet, S = speed in mph).
Is B Safety the same as Law and Business Safety?
No. Law and Business Safety is about the employer's program and reporting duties; B Safety is about the work, traffic and the environment. A few numbers overlap.
Last reviewed 29 September 2026 against the CSLB General Building (B) study guide 13E-B (03-2026); California Code of Regulations Title 8 §§1541.1 (Appendix B), 1592, 1620, 1669 and 3276; the California MUTCD Part 6 (2014 and 2026 editions); 40 CFR 745 subpart E and 40 CFR 61 subpart M; the State Water Resources Control Board's construction stormwater FAQ; and CalRecycle's CALGreen C&D page. Regulations change; confirm at the agency. Study guidance, not safety or legal advice. We are not affiliated with CSLB, Cal/OSHA or PSI.