Multi camera fleet video systems: how to cover the blind areas of large vehicles
Which cameras to fit, what federal mirror rules allow and how to test coverage
Safety Behind the Wheel Foundation built this guide from Federal Motor Carrier Safety Administration (FMCSA) exemption notices, Insurance Institute for Highway Safety (IIHS) data, Occupational Safety and Health Administration (OSHA) guidance, state driver manuals and laws, and published research on blind spots and camera displays. Every source is listed at the end.
Where large vehicles hide people
Every vehicle has blind areas. These are zones the driver cannot see directly or in a mirror. On a large truck, bus or step van (a walk in delivery van), those zones are bigger and appear in more places. They sit along the right side, behind the cargo box, at the front corners and near entry doors.
A trailer adds another problem. In a turn, the rear wheels of a long vehicle cut inside the path of the front wheels. Engineers call this off tracking. A person standing at the curb can end up inside that path.
Crash data show who carries the risk. Large truck collisions killed 5,340 people in 2024 [1]. About 19 percent of them were pedestrians, bicyclists or motorcyclists, and 62 percent were riding in cars or other passenger vehicles [1]. A researcher at the Insurance Institute for Highway Safety studied national crash records from 2004 to 2008. The study estimated that side view assist, a technology that watches the truck’s side, could apply to about 39,000 large truck collisions a year, including 79 fatal ones [2]. That figure is a ceiling on possible benefit, not a promise for any one product.
Workers face this risk too. In 2024, 369 workers died in incidents where a motor vehicle struck a person on foot, up 19 percent from 310 in 2023 [3]. OSHA, the federal workplace safety agency, warns that drivers may not see a worker in a blind spot and that backup alarms can go unheard on noisy sites [4].
What a multi camera system includes
A multi camera fleet video system has four main parts. Cameras sit around the vehicle. A recording unit stores video. One or more monitors show live views to the driver. Software lets managers pull clips and review alerts. NIOSH, the federal workplace health research institute, describes related in vehicle monitoring devices as tools that record and send data wirelessly to a computer. These devices also help supervisors coach drivers and find fleet wide problems [5].
Camera positions follow the blind areas:
- Side cameras look along the flank, especially the right side.
- A rear camera covers the space behind the bumper or cargo door.
- A trailer camera covers the trailer’s side and rear.
- Front corner or curb cameras cover the low area near the hood and the passenger side.
- A door camera shows the entry steps or cargo door, where people walk and load.
One design described in an FMCSA notice uses six cameras, with screens mounted on the windshield posts and 180 degree side views [6]. Treat that as an example only.
Delivery firms, service fleets, trucking companies and rideshare operators are the usual buyers. Most buy through fleet technology suppliers, truck equipment upfitters or a dealer’s parts department. Installation is usually done by trained technicians. The service often carries a recurring fee for software, storage and alerts. Ask what stops working if the subscription lapses.
Awareness cameras and mirror replacement systems
Two very different products share the label “multi camera.” A camera monitor system (CMS) uses cameras and in cab screens in place of mirrors. Awareness cameras only add views. Federal rules treat the two very differently.
Comparison compiled by Safety Behind the Wheel Foundation
Awareness cameras, mirror replacement systems and alerts compared
| Type | Main job | Do mirrors stay? |
|---|---|---|
| Awareness cameras (side, rear, trailer, door) | Show areas mirrors miss and record video | Yes |
| Camera monitor system approved by exemption | Replaces the two side mirrors with cameras and screens | Only for the named system and its conditions |
| Alert only blind spot sensors | Warn the driver of a person or vehicle alongside | Yes |
Most fleets begin with awareness cameras. They add views without changing the legal equipment on the vehicle.
What federal rules say about mirrors and cameras
As of October 2026, the federal rule is this. Each bus, truck and truck tractor operating in interstate commerce must carry two rear vision mirrors, one on each side [7]. There is no general permission to swap them for cameras.
FMCSA can grant exemptions, and it has done so for specific camera monitor systems. Each exemption covers one named system, lasts five years and carries conditions [6, 8]. The notices set conditions such as these:
- The driver checks the system before each trip.
- The driver notes any defect on the inspection report at the end of the day.
- The carrier repairs defects before the vehicle goes out again.
- The carrier includes the system in its periodic inspections.
Conditions can differ from one notice to the next [6, 8, 9]. An exemption for one maker does not cover another maker’s product.
In a 2024 decision, FMCSA found that the system’s field of view beat what the federal vehicle safety standard on mirrors (FMVSS No. 111) requires. It also beat the factory mirrors. The agency noted that one side kept working if a camera failed. It pointed to European approval under UN Regulation 46 and an international test standard, ISO 16505 [9]. Two commenters worried about camera failure or opposed replacing mirrors. FMCSA acknowledged those concerns and granted the exemption anyway [9]. In a second decision, the agency said it had no crash reports tied to earlier camera mirror exemptions [6].
The review is not finished. In July 2026, FMCSA asked for public comment on yet another maker’s application, with comments due August 31, 2026 [7].
Be careful with sales claims. In one renewal, the applicant told FMCSA that a fleet’s accident costs fell about 65 percent with the system. The comparison covered 24 million miles with it and 134 million miles without it [8]. That figure came from one fleet and measures cost, not the number of collisions avoided. Ask any supplier for independent evidence.
What states add to the picture
The mirror rule above is federal and reaches interstate operation [7]. Other rules come from the states, and details vary. Driver manuals are teaching documents rather than laws. Still, they show what each state expects drivers to know, and what a camera cannot replace.
- New Jersey. The commercial driver manual (March 2025) tells drivers to use a helper when backing whenever possible. The manual also tells them to leave the cab and walk all the way around the vehicle first. It says to back toward the driver’s side, because the right side is harder to see. It also warns that convex mirrors make objects look smaller and farther away than they are [10]. Safety Behind the Wheel Foundation urges every fleet driver to follow the same backing routine.
- Pennsylvania. The state driver’s manual speaks to everyone else on the road. It warns people not to cross behind a truck that is preparing to back up. It also says that if you cannot see a large vehicle’s side mirrors, its driver cannot see you [11].
- Connecticut. The state’s motor vehicle statutes include a section titled “Television screens or similar devices prohibited. Exceptions.” (Sec. 14‑105) [12]. A monitor in the cab is a screen near the driver. A fleet should read that section’s exceptions and ask the state motor vehicle agency before mounting one.
The federal rule covers interstate commerce [7]. Trips within one state fall under state rules, so ask your state motor carrier office whether cameras may replace mirrors for your routes.
Planning and verifying coverage
Do not trust a spec sheet. The routine starts with the real vehicle.
- Draw or photograph each vehicle type in your fleet, such as a cargo van, box truck, tractor trailer or bus. Mark the blind areas you know about.
- Park on level ground, set the parking brake, turn off the engine and keep the keys with the person in the driver’s seat.
- Have a person stand at marked spots around the vehicle: both front corners, both sides, both rear corners and several distances behind it. Include a child height object, such as a small cone.
- From the driver’s seat, record what each mirror and screen shows at each spot. Mark every spot where nothing shows the person.
- Move or add cameras to close the gaps. Wide lenses cover more ground, but they can make distances harder to judge, much as convex mirrors do [10].
- Repeat the test at night, in rain and in low sun glare. Write down the results and give each driver a coverage map for the vehicle they use.
Common mistakes include trusting a spec sheet, testing only in daylight, adding a camera that leaves another gap open, and forgetting to retest after a trailer swap. Another is treating a clear screen as proof that nobody is there.
Screen placement matters. A car simulator study with 22 participants found that screens near the driver’s normal line of sight, one on each side, reduced eye and head movement compared with mirrors [13]. It measured physical demand, not collisions. Even so, it supports putting each screen where the driver expects to look.
Driver habits that make the cameras work
A camera is only a view. The driver has to use it. A Dutch road safety institute followed 39 truck drivers through 1,903 right turns at city intersections. Most often, the drivers did not glance at their blind spot mirrors as recommended. They glanced less often when a camera covered that area [14]. The report does not say whether they looked at the screen instead. Read it as a reason to train and check, not as proof that cameras fail.
Alerts can help. Researchers fitted an add on blind spot monitoring system to 15 trucks and five buses for two years. They estimated it would cut warnings involving pedestrians and cyclists by about one third in trucks and 10 percent in buses [15]. The study counted warnings, not accidents.
Habits to teach:
- Walk around the vehicle before moving after any stop, even a short one.
- Use a helper when backing. If you are alone, get out and look [10].
- Check the screen, then the mirror and the road. No single view is enough.
- Slow down for right turns near curbs, bike lanes and crosswalks.
- Report any blank, frozen or dim screen right away.
Video also supports coaching. For how to use footage to coach rather than punish, see our article on fleet telematics and driver cameras.
Lens care and daily checks
Dirty or shifted cameras create new blind areas without anyone noticing. Self cleaning lenses and heaters help in some designs, though they do not replace a daily look [6, 8].
Recheck coverage after anything that can move a camera, such as a hard bump, body repair, windshield replacement or a trailer swap. Our article on cameras and sensor checks after crash repairs explains why a repair that looks finished can leave a system out of position.
Buying, installing and paying for the service
Questions to ask a fleet technology supplier:
- Can you show a coverage diagram for my exact vehicle models?
- If the system replaces mirrors, which exemption covers it? Does it name this system and these vehicles?
- What does the driver see if one camera or monitor fails?
- Who installs it, and who trains drivers and technicians?
- What are the recurring fees for software, storage and alerts? What happens if we stop paying?
- How long is video kept, who can view it, and can we turn audio off?
- How do we export original footage after a crash?
Recording rules, especially for audio, differ by state. Ask your attorney or insurer before you record sound. After an accident, protect the original files. See how to save dashcam video after a crash for the same steps.
The employer or vehicle owner chooses and maintains the system. Drivers use it and report defects.
Frequently asked questions
Can a fleet remove its mirrors and use cameras only?
Not as a general rule. Federal rules require two side mirrors on interstate buses, trucks and truck tractors [7]. FMCSA has approved certain camera systems through exemptions, each covering a named system with conditions [6, 8]. Check that the exemption names your system. For trips within one state, ask your state motor carrier office.
Do cameras remove blind spots?
They shrink them, but they do not erase them. Each camera has its own field of view, and gaps can remain between views. Test coverage on the real vehicle, and keep walk arounds and helpers in your routine.
How many cameras does a truck need?
It depends on the vehicle and its blind areas. A cargo van may need a rear and a side view. A tractor trailer may need more. Let the coverage test decide, not a number on a brochure.
What happens if a camera or monitor fails on the road?
Set the rule before it happens. For awareness cameras, the driver should use mirrors and extra caution, then report the defect. For an exempted mirror replacement system, the carrier must repair defects before the vehicle goes out again [6, 9]. Ask how the system behaves when one camera drops out.
Are these the same as dash cameras or driver facing cameras?
No. Dash cameras record the road ahead, and driver facing cameras watch the driver. A multi camera system watches the vehicle’s surroundings. Some products combine all three, but each raises different privacy questions.
What can other drivers and pedestrians do around camera equipped trucks?
Do not rely on the truck’s cameras to protect you. Stay out of the blind areas beside and behind the vehicle. Never cross behind a truck that is preparing to back up [11]. Local officials, school boards and small employers can use the buying questions above when they hire contractors. For more, see sharing the road with trucks and buses.
The bottom line
Recommendation from Safety Behind the Wheel Foundation
Safety Behind the Wheel Foundation urges fleets to treat cameras as an added view, test coverage on the real vehicle and keep every mirror the law requires. A multi camera system can give a driver views that mirrors never will. It works only when the coverage has been tested, the lenses are clean, the screens are placed well and drivers have the habit of looking. It supports safe driving rather than replacing it.
Treat mirror replacement as a regulated choice. Keep your mirrors unless an FMCSA exemption names your system, and follow its conditions. Test coverage, check it daily and ask suppliers for independent evidence.
Related articles
- Fleet telematics and driver cameras: how to coach drivers, not punish them
- Sharing the road with trucks and buses: No Zones, passing and stopping
- Parking lot, driveway and backing safety: beat your blind zones
- Fleet vehicle safety: how to choose, maintain and inspect work vehicles
- Why cameras and sensors need checks after crash repairs
Sources and further reading
- 1Insurance Institute for Highway Safety. Fatality Facts 2024: Large trucks. Updated June 2026. Data year: 2024. iihs.org/…/large-trucks
- 2Jermakian JS. Crash avoidance potential of four large truck technologies. Accident Analysis & Prevention, volume 49, pages 338-346. Published 2012. Data year: 2004 to 2008. doi.org/10.1016/j.aap.2010.10.033
- 3U.S. Bureau of Labor Statistics. Census of Fatal Occupational Injuries news release (2024 data). Released February 19, 2026. Data year: 2024. bls.gov/news.release/cfoi.nr0.htm
- 4Occupational Safety and Health Administration. Preventing Backovers. Undated page. osha.gov/preventing-backovers
- 5National Institute for Occupational Safety and Health, CDC. NEWSROOM FEATURE: In-vehicle Monitoring Systems. Updated June 7, 2021. archive.cdc.gov/…/in-vehicle.html
- 6Federal Motor Carrier Safety Administration. Parts and Accessories Necessary for Safe Operation (exemption granted for a camera monitor system; docket FMCSA-2024-0076). Federal Register, July 24, 2024. federalregister.gov/…/parts-and-accessories-necessary-for-sa…
- 7Federal Motor Carrier Safety Administration. Parts and Accessories Necessary for Safe Operation (application for exemption from the rear-vision mirror rule; docket FMCSA-2026-0859). Federal Register, July 30, 2026. federalregister.gov/…/parts-and-accessories-necessary-for-sa…
- 8Federal Motor Carrier Safety Administration. Parts and Accessories Necessary for Safe Operation (five-year exemption renewal for a camera monitor system). Federal Register, February 2, 2024. federalregister.gov/…/parts-and-accessories-necessary-for-sa…
- 9Federal Motor Carrier Safety Administration. Parts and Accessories Necessary for Safe Operation (five-year exemption granted for a camera monitor system). Federal Register, July 25, 2024. federalregister.gov/…/parts-and-accessories-necessary-for-sa…
- 10New Jersey Motor Vehicle Commission. Commercial Driver’s License Manual. Version March 2025. nj.gov/mvc/pdf/license/CDL_Manual.pdf
- 11Commonwealth of Pennsylvania, Driver and Vehicle Services. Pennsylvania Driver’s Manual, Chapter 3: Special Circumstances and Emergencies. Current page, undated. pa.gov/…/special-circumstances-and-emergencies
- 12Connecticut General Assembly. Connecticut General Statutes, Chapter 246: Motor Vehicles (section listing, including Sec. 14-105). Current online edition. cga.ct.gov/current/pub/chap_246.htm
- 13Beck D, Jung J, Park W. Evaluating the Effects of In-Vehicle Side-View Display Layout Design on Physical Demands of Driving. Human Factors, volume 63, pages 348-363. Published 2019. doi.org/10.1177/0018720819884781
- 14Jansen RJ, Varotto SF. Caught in the blind spot of a truck: A choice model on driver glance behavior towards cyclists at intersections. Accident Analysis & Prevention, volume 174, article 106759. Published 2022. doi.org/10.1016/j.aap.2022.106759
- 15Tomasch E, Smit S. Naturalistic driving study on the impact of an aftermarket blind spot monitoring system on the driver’s behaviour of heavy goods vehicles and buses on reducing conflicts with pedestrians and cyclists. Accident Analysis & Prevention, volume 192, article 107242. Published 2023. Data year: two-year study period (years not stated in abstract). doi.org/10.1016/j.aap.2023.107242
This article reflects the safety priorities of commercial vehicle visibility and protecting people around large vehicles. It is general education, not legal, insurance or financial advice. Mirror, screen and recording rules change, so verify details with official sources. For your own fleet, contact the Federal Motor Carrier Safety Administration, your state motor vehicle or motor carrier agency, your insurer, a qualified attorney and your vehicle maker or installer. Reviewed October 2026.
Cite this article: Safety Behind the Wheel Foundation. “Multi camera fleet video systems: how to cover the blind areas of large vehicles.” drivewithcare.org, https://drivewithcare.org/multi-camera-fleet-video-system-blind-areas/. Reviewed October 2026.
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