| | Exhibit 31.1
| | ------------

# CERTIFICATION

I, Brad A. Hummel, President and Chief Executive Officer
 of Prime Medical Services, Inc., certify that:

|1. | I have reviewed this annual report on Form 10-K
 of Prime Medical Services, Inc.;
|-- | ---------------------------------------------------------------------------------

|2. | Based on my knowledge, this report does not contain
 any untrue statement of a material fact or omit to state a material fact necessary to make the statements
 made, in light of the circumstances under which such statements were made, not misleading with respect
 to the period covered by this report;
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|3. | Based on my knowledge, the financial statements, and
 other financial information included in this report, fairly present in all material respects the financial
 condition, results of operations and cash flows of the registrant as of, and for, the periods presented
 in this report;
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|4. | The registrants other certifying officer(s) and I
 are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange
 Act Rules 13a-15(e) and 15d-15(e) for the registrant and have:
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (a) Designed such disclosure controls and procedures,
 or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
 material information relating to the registrant, including its consolidated subsidiaries, is made known
 to us by others within those entities, particularly during the period in which this report is being
 prepared;
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (b) Evaluated the effectiveness of the registrants
 disclosure controls and procedures and presented in this report our conclusions about the effectiveness
 of the disclosure controls and procedures, as of the end of the period covered by this report based
 on such evaluation; and
| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (c) Disclosed in this report any change in the registrants
 internal control over financial reporting that occurred during the registrants most recent fiscal quarter
 (the registrants fourth fiscal quarter in the case of an annual report) that has materially affected,
 or is reasonably likely to materially affect, the registrants internal control over financial reporting;
 and
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|5. | The registrants other certifying officer(s) and I
 have disclosed, based on our most recent evaluation of internal control over financial reporting, to
 the registrants auditors and the audit committee of the registrants board of directors (or persons
 performing the equivalent functions):
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (a) All significant deficiencies and material weaknesses
 in the design or operation of internal control over financial reporting which are reasonably likely
 to adversely affect the registrants ability to record, process, summarize and report financial information;
 and
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (b) Any fraud, whether or not material, that involves
 management or other employees who have a significant role in the registrants internal control over
 financial reporting.
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|Date: February 26, 2004 |  | By: /s/ Brad A. Hummel         Brad A. Hummel        President and Chief Executive Officer
|----------------------- |  | ------------------------------------------------------------------------------------------