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ArticleCDL Passenger Endorsement Exam Guide 2026: P Endorsement Study Plan12 min read
Exam Review

Key Facts: Iowa CDL Passenger Exam

20 questions

Iowa Passenger knowledge test length (up to 4 may be missed)

Iowa DOT CDL Testing

80%

Minimum passing score on each CDL knowledge test

49 CFR 383.135

16 or more

Design capacity, including the driver, that requires the P endorsement

Iowa CDL Manual Section 1

15 to 50 feet

Required stopping distance from the nearest rail for buses carrying passengers

Iowa Code section 321.343

500 pounds

Maximum total of allowed hazardous materials on a bus

Iowa CDL Manual Section 4.2.2

$10

Iowa Passenger endorsement fee

Iowa DOT Driver's License Fees

Iowa's Passenger knowledge test has 20 questions, and you may miss up to 4. It covers Sections 2 and 4 of the Iowa CDL Manual: bus inspection, baggage and hazardous materials limits, rider supervision, railroad crossings and drawbridges, prohibited practices, and safe driving. The P endorsement costs $10.

Sample Iowa CDL Passenger Practice Questions

Try these sample questions to review concepts for the Iowa CDL Passenger exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 205+ question experience with AI tutoring.

1An Iowa county senior-services agency buys a 20-passenger cutaway bus with a GVWR of 14,500 pounds. What license does its driver need?
A.A noncommercial Class C operator license, because the GVWR is under 26,001 pounds
B.A Class D chauffeur license with endorsement 3 for passenger-for-hire vehicles
C.A Class C CDL with a Passenger (P) endorsement
D.A Class B CDL with no endorsement, because all buses are Class B
Explanation: A vehicle designed to transport 16 or more people, including the driver, requires a CDL even when its GVWR is under 26,001 pounds. A bus that size is a Class C commercial vehicle, and the Passenger endorsement applies to buses in any class (A, B, or C).
2A bus built to carry 24 people has been modified to carry 10 wheelchair users. Its GVWR is 16,000 pounds. According to Iowa DOT, does its driver need a Passenger endorsement?
A.No, because after the modification it is designed for fewer than 16 people
B.Yes, because Iowa's P rule covers this kind of modified vehicle
C.No, because only vehicles with a GVWR of 26,001 pounds or more need a CDL
D.Yes, but only when the riders using wheelchairs pay a fare
Explanation: Iowa DOT's Passenger endorsement rule includes a redesigned or modified vehicle with a GVWR of 10,001 pounds or more used to transport fewer than 16 persons with disabilities. Iowa Code section 321.1 likewise treats a vehicle of a size and design for 16 or more that was modified for fewer than 16 persons with disabilities as a commercial motor vehicle.
3Your first bus job is in a coach with air-over-hydraulic brakes. Which knowledge tests does the Iowa CDL Manual say you need?
A.General knowledge and Passenger only, because air-over-hydraulic brakes are not air brakes
B.Passenger and School Bus, because every bus driver takes both
C.Passenger and Air Brakes only, because general knowledge is optional for bus drivers
D.General knowledge, Passenger, and Air Brakes
Explanation: All applicants take the general knowledge test, and bus drivers take the passenger test. Section 1.1.1 says the air brakes test is required if your vehicle has air brakes, including air over hydraulic brakes.
4According to Section 4 of the Iowa CDL Manual, which manual sections does the Passenger endorsement knowledge test cover?
A.Sections 2 and 4
B.Section 4 only
C.Section 10
D.Sections 3 and 4
Explanation: Section 4 says that to get the passenger endorsement you must pass a knowledge test on Sections 2 (Driving Safely) and 4 (Transporting Passengers Safely). If the bus has air brakes, you must also pass the Section 5 test.
5Iowa DOT's Passenger knowledge test has 20 questions. What is the most you can miss and still pass?
A.2 questions
B.4 questions
C.5 questions
D.6 questions
Explanation: Iowa DOT lists the Passenger test as 20 questions with 4 allowed misses. That matches the federal 80% passing standard: 16 correct out of 20.
6You pass the Iowa passenger skills test in a transit bus that requires a Class B CDL. Which restriction will appear on your CDL?
A.N: no Class A or B passenger vehicle
B.P: no passengers in a CMV bus
C.K: intrastate only
D.M: no Class A passenger vehicle
Explanation: Restriction M applies when a passenger-endorsement applicant takes the skills test in a passenger vehicle requiring a Group B CDL. It bars Class A passenger vehicles; the Iowa manual adds that in Iowa no Class A passenger vehicles are allowed.
7A driver passed the Iowa passenger skills test in a Class C minibus. Now an employer offers a route in a 45-passenger Class B coach. What does the driver's restriction allow?
A.The driver may take the job, because a P endorsement covers buses in any class
B.The driver may take the job after passing the Air Brakes knowledge test
C.The driver needs to pass a skills test in a Class B passenger vehicle first
D.The driver may take the job if the coach carries fewer than 30 riders
Explanation: Testing in a Group C passenger vehicle results in restriction N: no Class A or B passenger vehicle. To drive the Class B coach, the driver must hold a Class B CDL and pass the passenger skills test in a representative Class B passenger vehicle.
8During training on an Iowa learner's permit (CLP) with a P endorsement, your supervisor asks you to carry four office staff to a meeting. What does the P restriction allow?
A.Only auditors or inspectors, test examiners, other trainees, and the CDL holder with you
B.Up to 15 riders, because the bus is less than half full
C.Any riders at all, as long as the accompanying CDL holder sits right behind you and watches
D.Company employees only, because they are not members of the public
Explanation: A CLP issued with a Passenger endorsement carries restriction P: no passengers in a CMV bus other than federal or state auditors and inspectors, test examiners, other trainees, and the CDL holder accompanying the permit holder. Iowa DOT's CLP page repeats that permit holders cannot carry passengers.
9What must a first-time Passenger endorsement applicant complete before Iowa DOT will give the passenger skills test?
A.Hold the CLP at least 14 days and complete entry-level driver training
B.Hold the CLP at least 30 days and log 40 supervised driving hours
C.Hold the CLP at least 7 days; training is required only for Class A
D.Nothing more; the skills test may follow the knowledge test
Explanation: Iowa DOT requires CDL applicants to hold the CLP for at least 14 days and meet the entry-level driver training (ELDT) requirement before the skills and drive test. ELDT applies to a first-time P, S, or H endorsement as well as a first-time Class A or B CDL.
10Iowa DOT issues your CLP with a P endorsement on March 1. For how long can you use it?
A.180 days, with one 180-day renewal allowed
B.Two years, matching the knowledge test results
C.One year from issuance, with no renewal
D.Until the applicant passes the CDL skills test
Explanation: Iowa DOT says the CLP costs $12 and is valid for one year from the date of issuance, with no renewal period. The permit must be added to an existing license.

About the Iowa CDL Passenger Exam

Iowa requires the Passenger (P) endorsement to drive a vehicle designed to carry 16 or more people, including the driver, in any class. The knowledge test covers Sections 2 and 4 of the Iowa CDL Manual, and Iowa adds rules such as restrictions M and N and the Iowa Code 321.343 railroad-crossing stop. This independent multiple-choice practice by OpenExamPrep helps you study those topics; it is a study aid, not a copy of the official test, and it does not replace the skills test.

Exam sponsor: Iowa Department of Transportation. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The Passenger knowledge test covers Sections 2 and 4 of the Iowa CDL Manual. Bus applicants also take the general knowledge test and, if the bus has air brakes, the Air Brakes test. After holding a CLP at least 14 days and completing ELDT, they take a three-part skills test (pre-trip inspection, basic control skills, on-road driving) in a passenger vehicle of the class they want; testing in a Group B or C bus adds restriction M or N.

Time Limit

Iowa DOT does not publish a time limit for the Passenger knowledge test

Passing Score

80% (20 questions; up to 4 missed)

Exam / Certification Fees

$10 Passenger endorsement; $12 CLP; CDL $8 per year of the term; $10 card fee if added outside the renewal period (Iowa DOT)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Iowa CDL Manual Section 1 & Iowa DOT

Iowa P Endorsement Rules

Who needs the P endorsement, knowledge tests required, the 20-question/4-miss format, CLP restriction P, restrictions M and N, ELDT, the 14-day CLP period, age limits, and Iowa fees.

Iowa CDL Manual Sections 4.1 and 11.2

Bus Inspection

Previous driver's report, vehicle systems, front tire rules, emergency equipment, access panels, interior items, emergency exits and roof hatches, and Iowa's skills-test inspection items.

Iowa CDL Manual Section 4.2

Loading and Hazardous Materials

Carry-on baggage, hazard labels, allowed and forbidden hazardous materials, the 100-pound per-class and 500-pound total limits, the standee line, and stop announcements.

Iowa CDL Manual Section 4.3 & Iowa Code 321.343

On the Road and Crossings

Passenger supervision, disruptive riders, common bus crashes, speed on curves, railroad crossing stops 15 to 50 feet from the nearest rail, exceptions, and drawbridges.

Iowa CDL Manual Sections 4.4 to 4.6

After-Trip Inspection and Prohibited Practices

End-of-shift inspection reports, rider damage, fueling with riders aboard, distractions, towing a disabled bus, and brake-door interlocks.

Iowa CDL Manual Section 2

Driving Safely for Bus Drivers

Following distance, seeing ahead, slippery roads and black ice, retarders, hydroplaning, turns, overhead clearance, backing, warning devices, and tailgaters.

Preparing for the Iowa CDL Passenger Exam

What You Need to Know

  • Passing score: 80% (20 questions; up to 4 missed)
  • Assessment: The Passenger knowledge test covers Sections 2 and 4 of the Iowa CDL Manual. Bus applicants also take the general knowledge test and, if the bus has air brakes, the Air Brakes test. After holding a CLP at least 14 days and completing ELDT, they take a three-part skills test (pre-trip inspection, basic control skills, on-road driving) in a passenger vehicle of the class they want; testing in a Group B or C bus adds restriction M or N.
  • Time limit: Iowa DOT does not publish a time limit for the Passenger knowledge test
  • Exam / certification fees: $10 Passenger endorsement; $12 CLP; CDL $8 per year of the term; $10 card fee if added outside the renewal period (Iowa DOT) Official sources

Using Our Practice Resources

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Iowa CDL Passenger: Suggested Study Strategy

1Read Sections 2 and 4 of the Iowa CDL Manual; the Passenger test is drawn from both.
2Memorize the hazardous materials limits: never Division 2.3 poison gas, liquid Class 6 poison, tear gas, or irritating material; no more than 100 pounds of any one class or 500 pounds in total.
3Know Iowa's railroad crossing rule: stop 15 to 50 feet from the nearest rail, look and listen, and never shift gears on the tracks.
4Practice the following distance rule: one second per 10 feet of vehicle length below 40 mph, plus one second above 40 mph.
5Review the Section 11 bus items for the skills test: emergency exits, passenger entry and lift, seating, and passenger mirrors.

Frequently Asked Questions

Who needs a Passenger endorsement in Iowa?

Anyone driving a vehicle designed to transport 16 or more persons, including the driver, needs a CDL with a P endorsement. Iowa DOT also applies it to a vehicle of 10,001 pounds GVWR or more that was modified to carry fewer than 16 persons with disabilities.

How many questions are on the Iowa CDL Passenger test?

Iowa DOT lists the Passenger knowledge test as 20 questions, and you may miss up to 4. You also need the general knowledge test, and the Air Brakes test if your bus has air brakes.

Where must a bus stop at a railroad crossing in Iowa?

Iowa Code section 321.343 requires a vehicle carrying passengers for hire to stop within 50 feet but not less than 15 feet from the nearest rail, then listen and look both ways and proceed only when safe. The manual adds that you should open the forward door if it helps you see or hear a train.

What hazardous materials can a bus carry?

Buses may carry small-arms ammunition labeled ORM-D, emergency hospital supplies, and drugs, and small amounts of some other hazardous materials if there is no other way to ship them. They may never carry Division 2.3 poison gas, liquid Class 6 poison, tear gas, or irritating material, and the total of allowed materials is capped at 500 pounds, with no more than 100 pounds of any one class.

What happens if I take the passenger skills test in a smaller bus?

Testing in a passenger vehicle that requires a Class B CDL adds restriction M (no Class A passenger vehicle). Testing in one that requires a Class C CDL adds restriction N (no Class A or B passenger vehicle).