A bus is leaving a curbside stop close to a pole and passing traffic. What needs particular attention?
Correct answer: The clearance of mirrors and the bus body as it pulls away.
Bus mirrors and bodywork can strike fixed objects or passing vehicles near stops. Check the clearance needed before and during the departure.
Source: South Carolina Commercial Driver's License Manual, body version March 2025; Section 4.3.3; Mirror clearance at stops; printed 4-3; physical PDF page 85; reviewed September 21, 2026. ↗
A driver assumes a bus cannot roll over on a curve because the pavement has good traction. Why is that unsafe?
Correct answer: A bus can roll over from excessive cornering speed without first sliding.
Grip can be sufficient for a bus to roll rather than slide when cornering too fast. Choose a suitable speed before the curve; a posted value is not a guarantee for the bus and conditions.
Source: South Carolina Commercial Driver's License Manual, body version March 2025; Section 4.3.4; Bus cornering and good traction; printed 4-3; physical PDF page 85; reviewed September 21, 2026. ↗
A transit bus's rear-door interlock holds its brakes while the door is open. May the driver rely on it instead of the parking brake?
Correct answer: No; use the proper parking brake rather than the door interlock.
A brake-door interlock may release as the door closes. Its door-safety function is not a substitute for properly parking the vehicle.
Source: South Carolina Commercial Driver's License Manual, body version March 2025; Section 4.6; Brake-door interlock is not parking; printed 4-4; physical PDF page 86; reviewed September 21, 2026. ↗
A bus is being fueled and there is no need to run its engine for the fueling operation. What should the driver do?
Correct answer: Shut off the engine before fueling.
The federal rule prohibits fueling a CMV with its engine running except when engine operation is necessary to fuel it. Passenger comfort is not that exception.
Source: 49 CFR 392.50(a); official eCFR text current through September 17, 2026; reviewed September 21, 2026. ↗
During bus fueling, how must the fuel-hose nozzle relate to the fuel tank's intake pipe?
Correct answer: Remain continuously in contact with the intake pipe.
The nozzle must remain in contact with the intake pipe while fueling. Also prevent smoking, flames and other foreseeable ignition hazards.
Source: 49 CFR 392.50(b)–(d); official eCFR text current through September 17, 2026; reviewed September 21, 2026. ↗
A bus is disabled where having passengers get off would be unsafe. Under the handbook's guidance, how far may a necessary tow or push with them aboard go?
Correct answer: To the nearest safe place where the passengers can get off.
The handbook's exception is tied to unsafe unloading at the breakdown location. It calls for the nearest safe discharge point, not carrying passengers on a routine tow to a distant destination.
Source: South Carolina Commercial Driver's License Manual, body version March 2025; Section 4.5; Disabled bus with unsafe evacuation; printed 4-3; physical PDF page 85; reviewed September 21, 2026. ↗
A driver proposes refueling a bus inside a closed building while its passengers remain aboard. What does the South Carolina CDL handbook direct?
Correct answer: Do not refuel there with passengers aboard.
The handbook specifically warns against refueling in a closed building with riders aboard. Its general advice is to avoid fueling with riders aboard unless absolutely necessary.
Source: South Carolina Commercial Driver's License Manual, body version March 2025; Section 4.5; Refueling inside a building; printed 4-3; physical PDF page 85; reviewed September 21, 2026. ↗
Which stated exception to the federal ban on Class 1 explosives in the passenger space of a for-hire vehicle does the rule identify?
Correct answer: Small-arms ammunition, subject to the other applicable requirements.
The passenger-space rule identifies small-arms ammunition as an exception, not general permission for other explosives. Other shipment conditions still apply; this is not an ORM-D authorization.
Source: 49 CFR 177.870(c); official eCFR text current through September 17, 2026; reviewed September 21, 2026. ↗
Assume a for-hire passenger vehicle may lawfully carry a non-Class 1 hazardous shipment and no special exception applies. Under the federal per-class limit, what gross weight must one given class not exceed?
Correct answer: 45 kg (99 lb).
The rule uses 45 kg (99 pounds) per given class. Meeting this number alone does not authorize carriage; material, packaging, location and other conditions must also be met.
Source: 49 CFR 177.870(e); official eCFR text current through September 17, 2026; reviewed September 21, 2026. ↗
Assume authorized non-Class 1 hazardous articles on a for-hire passenger vehicle, with no special exception. What is their aggregate gross-weight limit under the federal rule?
Correct answer: 225 kg (496 lb).
The aggregate limit is 225 kg (496 pounds), in addition to the per-class limit and other requirements. The handbook's rounded 500-pound wording is not the precise current regulatory value.
Source: 49 CFR 177.870(e); official eCFR text current through September 17, 2026; reviewed September 21, 2026. ↗
A labeled Class 7 package qualifies for transport on a passenger-for-hire vehicle because no other practicable transport is available and all other conditions are met. Where may it be stowed?
Correct answer: In the trunk or baggage compartment, not an occupied compartment.
The rule restricts such packages to the trunk or baggage compartment and forbids storage in a compartment occupied by persons. Qualification for transport does not remove the location restriction.
Source: 49 CFR 177.870(g); official eCFR text current through September 17, 2026; reviewed September 21, 2026. ↗
A rider tries to board with a can of gasoline that has no hazard label. What should the bus driver do?
Correct answer: Prevent it from being brought aboard as ordinary carry-on baggage.
A missing label does not remove the hazard. The handbook specifically warns about passengers bringing common hazards such as gasoline or car batteries aboard.
Source: South Carolina Commercial Driver's License Manual, body version March 2025; Section 4.2.2; Unlabeled hazardous baggage; printed 4-2; physical PDF page 84; reviewed September 21, 2026. ↗
A bus carrying passengers approaches an ordinary South Carolina railroad crossing where a stop is required. Where must the driver stop?
Correct answer: Between 15 and 50 feet from the nearest rail.
South Carolina measures the required stop from the nearest rail: at least 15 feet and no more than 50 feet away. The driver must look and listen in both directions while stopped and proceed only when safe.
Source: South Carolina Code of Laws, Section 56-5-2720(A); current official posted text reviewed September 21, 2026. ↗
Traffic beyond a South Carolina railroad crossing leaves room for the front of your bus but not for the whole bus to clear the tracks. What should you do?
Correct answer: Wait until there is enough space for the whole bus beyond the crossing.
Do not enter unless there is enough room beyond the crossing to accommodate the whole vehicle without obstructing trains or other traffic. A signal to proceed does not override this South Carolina clearance requirement.
Source: South Carolina Code of Laws, Section 56-5-2735(A); current official posted text reviewed September 21, 2026. ↗
