Menu Close

News and Updates

Return to News & Updates

Joint Statement on Lights and Siren Vehicle Operations

As a member of several of the sponsoring organizations, REMSA Health is proud to support this Joint Statement on Lights and Siren Vehicle Operations. Our Quality Assurance program, medical director oversight, emergency vehicle training, commitment to continuous clinical improvement, and the medically trained dispatchers in our ACE Accredited EMD center demonstrate our ongoing commitment to raising awareness about the importance of reducing the use of lights and siren in emergency response.

Click to View Downloadable Statement


Joint Statement on Lights & Siren Vehicle Operations on Emergency Medical Services (EMS) Responses


Douglas F. Kupas, Matt Zavadsky, Brooke Burton, Shawn Baird, Jeff J. Clawson, Chip Decker, Peter Dworsky,
Bruce Evans, Dave Finger, Jeffrey M. Goodloe, Brian LaCroix, Gary G. Ludwig, Michael McEvoy, David K. Tan,
Kyle L. Thornton, Kevin Smith, Bryan R. Wilson

The National Association of EMS Physicians and the then National Association of State EMS Directors created a
position statement on emergency medical vehicle use of lights and siren in 1994 (1). This document updates
and replaces this previous statement and is now a joint position statement with the Academy of International
Mobile Healthcare Integration, American Ambulance Association, American College of Emergency Physicians,

Center for Patient Safety, International Academies of Emergency Dispatch, International Association of EMS
Chiefs, International Association of Fire Chiefs, National Association of EMS Physicians, National Association of

Emergency Medical Technicians, National Association of State EMS Officials, National EMS Management
Association, National EMS Quality Alliance, National Volunteer Fire Council and Paramedic Chiefs of Canada.

In 2009, there were 1,579 ambulance crash injuries (2), and most EMS vehicle crashes occur when driving with
lights and siren (L&S) (3). When compared with other similar-sized vehicles, ambulance crashes are more
often at intersections, more often at traffic signals, and more often with multiple injuries, including 84%
involving three or more people (4).

From 1996 to 2012, there were 137 civilian fatalities and 228 civilian injuries resulting from fire service vehicle
incidents and 64 civilian fatalities and 217 civilian injuries resulting from ambulance incidents. According to the
U.S. Fire Administration (USFA), 179 firefighters died as the result of vehicle crashes from 2004 to 2013 (5).
The National EMS Memorial Service reports that approximately 97 EMS practitioners were killed in ambulance
collisions from 1993 to 2010 in the United States (6).

Traffic-related fatality rates for law enforcement officers, firefighters, and EMS practitioners are estimated to
be 2.5 to 4.8 times higher than the national average among all occupations (7). In a recent survey of 675 EMS
practitioners, 7.7% reported being involved in an EMS vehicle crash, with 100% of those occurring in clear
weather and while using L&S. 80% reported a broadside strike as the type of MVC (8). Additionally, one survey
found estimates of approximately four “wake effect” collisions (defined as collisions caused by, but not
involving the L&S operating emergency vehicle) for every crash involving an emergency vehicle (9).

For EMS, the purpose of using L&S is to improve patient outcomes by decreasing the time to care at the scene
or to arrival at a hospital for additional care, but only a small percentage of medical emergencies have better
outcomes from L&S use. Over a dozen studies show that the average time saved with L&S response or
transport ranges from 42 seconds to 3.8 minutes. Alternatively, L&S response increases the chance of an EMS
vehicle crash by 50% and almost triples the chance of crash during patient transport (11). Emergency vehicle
crashes cause delays to care and injuries to patients, EMS practitioners, and the public. These crashes also
increase emergency vehicle resource use through the need for additional vehicle responses, have long-lasting
effects on the reputation of an emergency organization, and increases stress and anxiety among emergency
services personnel.

Despite these alarming statistics, L&S continue to be used in 74% of EMS responses, and 21.6% of EMS
transports, with a wide variation in L&S use among agencies and among census districts in the United States

Although L&S response is currently common to medical calls, few (6.9%) of these result in a potentially
lifesaving intervention by emergency practitioners (12). Some agencies have used an evidence-based or
quality improvement approach to reduce their use of L&S during responses to medical calls to 20-33%,
without any discernable harmful effect on patient outcome. Additionally, many EMS agencies transport very
few patients to the hospital with L&S.

Emergency medical dispatch (EMD) protocols have been proven to safely and effectively categorize requests
for medical response by types of call and level of medical acuity and urgency. Emergency response agencies

have successfully used these EMD categorizations to prioritize the calls that justify a L&S response. Physician
medical oversight, formal quality improvement programs, and collaboration with responding emergency
services agencies to understand outcomes is essential to effective, safe, consistent, and high-quality EMD.

The sponsoring organizations of this statement believe that the following principles should guide L&S use
during emergency vehicle response to medical calls and initiatives to safely decrease the use of L&S when

  • The primary mission of the EMS system is to provide out-of-hospital health care, saving lives and
    improving patient outcomes, when possible, while promoting safety and health in communities. In
    selected time-sensitive medical conditions, the difference in response time with L&S may improve the
    patient’s outcome.
  • EMS vehicle operations using L&S pose a significant risk to both EMS practitioners and the public.
    Therefore, during response to emergencies or transport of patients by EMS, L&S should only be used for situations where the time saved by L&S operations is anticipated to be clinically important to a
    patient’s outcome. They should not be used when returning to station or posting on stand-by
  • Communication centers should use EMD programs developed, maintained, and approved by national
    standard-setting organizations with structured call triage and call categorization to identify subsets of
    calls based upon response resources needed and medical urgency of the call. Active physician medical
    oversight is critical in developing response configurations and modes for these EMD protocols. These
    programs should be closely monitored by a formal quality assurance (QA) program for accurate use
    and response outcomes, with such QA programs being in collaboration with the EMS agency physician
    medical director.
  • Responding emergency agencies should use response based EMD categories and other local policies to
    further identify and operationalize the situations where L&S response or transport are clinically
    justified. Response agencies should use these dispatch categories to prioritize expected L&S response
    modes. The EMS agency physician medical director and QA programs must be engaged in developing
    these agency operational policies/guidelines.
  • Emergency response agency leaderships, including physician medical oversight and QA personnel should monitor the rates of use, appropriateness, EMD protocol compliance, and medical outcomes
    related to L&S use during response and patient transport.
  • Emergency response assignments based upon approved protocols should be developed at the local/department/agency level. A thorough community risk assessment, including risk reduction analysis, should be conducted, and used in conjunction with local physician medical oversight to develop and establish safe response policies.
  • All emergency vehicle operators should successfully complete a robust initial emergency vehicle driver training program, and all operators should have required regular continuing education on emergency vehicle driving and appropriate L&S use.
  • Municipal government leaders should be aware of the increased risk of crashes associated with L&S response to the public, emergency responders, and patients. Service agreements with emergency medical response agencies can mitigate this risk by using tiered response time expectations based upon EMD categorization of calls. Quality care metrics, rather than time metrics, should drive these contract agreements.
  • Emergency vehicle crashes and near misses should trigger clinical and operational QA reviews. States and provinces should monitor and report on emergency medical vehicle crashes for better understanding of the use and risks of these warning devices.
  • EMS and fire agency leaders should work to understand public perceptions and expectations regarding L&S use. These leaders should work toward improving public education about the risks of L&S use to create safer expectations of the public and government officials.

In most settings, L&S response or transport saves less than a few minutes during an emergency medical
response, and there are few time-sensitive medical emergencies where an immediate intervention or
treatment in those minutes is lifesaving. These time-sensitive emergencies can usually be identified through
utilization of high-quality dispatcher call prioritization using approved EMD protocols. For many medical calls,
a prompt response by EMS practitioners without L&S provides high-quality patient care without the risk of
L&S-related crashes. EMS care is part of the much broader spectrum of acute health care, and efficiencies in
the emergency department, operative, and hospital phases of care can compensate for any minutes lost with
non-L&S response or transport.

Sponsoring Organizations and Representatives:

  • Academy of International Mobile Healthcare Integration
  • American Ambulance Association
  • American College of Emergency Physicians
  • Center for Patient Safety
  • International Academies of Emergency Dispatch
  • International Association of EMS Chiefs
  • International Association of Fire Chiefs
  • National Association of EMS Physicians
  • National Association of Emergency Medical Technicians
  • National Association of State EMS Officials
  • National EMS Management Association
  • National EMS Quality Alliance
  • National Volunteer Fire Council
  • Paramedic Chiefs of Canada


  1. Use of warning lights and siren in emergency medical vehicle response and patient transport. Prehosp and Disaster
    Med. 1994;9(2):133-136.
  2. Grant CC, Merrifield B. Analysis of ambulance crash data. The Fire Protection Research Foundation. 2011. Quincy, MA.
  3. Kahn CA, Pirallo RG, Kuhn EM. Characteristics of fatal ambulance crashes in the United States: an 11-year
    retrospective analysis. Prehosp Emerg Care. 2001;5(3):261-269.
  4.  Ray AF, Kupas DF. Comparison of crashes involving ambulances with those of similar-sized vehicles. Prehosp Emerg
    Care. 2005;9(4):412-415.
  5. U.S. Fire Administration. Firefighter fatalities in the United States in 2013. 2014. Emmitsburg, MD.
  6. Maguire BJ. Transportation-related injuries and fatalities among emergency medical technicians and paramedics.
    Prehosp Disaster Med. 2011;26(5): 346-352.
  7. Maguire BJ, Hunting KL, Smith GS, Levick NR. Occupational fatalities in emergency medical services: A hidden crisis. Ann Emerg Med, 2002;40: 625-632.
  8. Drucker C, Gerberich SG, Manser MP, Alexander BH, Church TR, Ryan AD, Becic E. Factors associated with civilian drivers involved in crashes with emergency vehicles. Accident Analysis & Prevention. 2013; 55:116-23.
  9. Clawson JJ, Martin RL, Cady GA, Maio RF. The wake effect: emergency vehicle-related collisions. Prehosp Disaster. Med. 1997; 12 (4):274-277.
  10. Kupas DF. Lights and siren use by emergency medical services: Above all, do no harm. National Highway Traffic Safety Administration. 2017. Available online at
  11. Watanabe BL, Patterson GS, Kempema JM, Magailanes O, Brown LH. Is use of warning lights and sirens associated with increased risk of ambulance crashes? A contemporary analysis using national EMS information system (NEMSIS) data. Ann Emerg Med. 2019;74(1):101-109.
  12. Jarvis JL, Hamilton V, Taigman M, Brown LH. Using red lights and sirens for emergency ambulance response: How often are potentially life-saving interventions performed? Prehosp Emerg Care. 2021; 25(4): 549-555.


Want to join the team?

Explore Openings


Get trained for a career in EMS

Explore Programs
Get in Touch
General Information (775) 858-5700
Emergency 911