Questions for the certification examination are derived and/or documented from a number of professional sources. Some of the most frequently cited references are:

• AASHTO, A Policy on Geometric Design of Highways and Streets, 5th ed., 2004, Washington, DC. (Publ. No. LP-323C).
• FHWA/ITE/ATSSA/AASHTO, Manual on Uniform Traffic Control Devices, 2003, Washington, DC. (Publ. No. MUTCD-1A).
• ITE, Traffic Engineering Handbook, 5th ed., 2000, Washington, DC. (Publ. No. TB-010A).
• ITE, Manual of Transportation Engineering Studies, 1994, Washington, DC. (Publ. No. TB-012).
• ITE, Traffic Safety Toolbox, 1999, Washington, DC. (Publ. No. LP-279A).
• ITE, Transportation Planning Handbook, 2nd ed., 1999, Washington, DC. (Publ. No. TB-011A).
• TRB, Highway Capacity Manual, 2000, Washington, DC. (Publ. No. LP-608).

In addition to these professional references, a candidate may find it advantageous to review a general traffic or transportation engineering text. Among the excellent texts currently available, the following were frequently cited in question documentation: 

• Garber and Hoel, Traffic and Highway Engineering, 2nd ed., 1996, PWS Publications. (Publ. No. LP-402A).
• Homburger et al., Fundamentals of Traffic Engineering, 15th ed., 2001, University of California. (Publ. No. LP-003F).
• McShane et al., Traffic Engineering, 3rd ed., 2004, Prentice-Hall. (Publ. No. LP-166B).