BS ISO 20901:2020

What is BS ISO 20901 about?  

BS ISO 20901 contains the basic alert strategy, minimum functionality requirements, basic driver interface elements, minimum requirements for diagnostics and reaction to failure, and performance test procedures for Emergency Electronic Brake Light systems (EEBL). 

EEBL alerts the driver against danger caused by the emergency braking of an FV on the upcoming road, so that the driver may reduce the speed. The system does not include the means to control the vehicle to meet the desired speed. The responsibility for the safe operation of the vehicle always remains with the driver. 

NOTE: BS ISO 20901 applies to light-duty vehicles and heavy vehicles. These systems are not intended for off-road use. 

NOTE: BS ISO 20901 does not include performance requirements and test procedures of the wireless communication device used for EEBL. The test procedure in BS ISO 20901 is designed for third-party testing of the product while the test procedure can also be used for other stakeholders such as manufacturers of consumer unions. 

Who is BS ISO 20901 for? 

BS ISO 20901 on emergency electronic brake light systems (EEBL) is useful for: 

• Electronic engineers 
• Road vehicle engineers 
• Manufacturers of electronic brake light systems 
• Personnel of communication and signalling device systems 

Why should you use BS ISO 20901?  

Emergency Electronic Brake Light systems (EEBL) alert the driver against the danger caused by the emergency braking of a forward vehicle (FV) on the upcoming road. 

BS ISO 20901 provides the basic and necessary functions of EEBL to provide an alert to drivers and does not perform vehicle control to mitigate the crash. 

Also, guides on maximum operational speed value and general alert functionality to provide an alert for emergency braking providing the performance requirement of EEBL. 

BS ISO 20901 provides the performance evaluation test methods based on the environmental factors, requirements for the test systems installation and configuration, and five test cases for EEBL that includes: 

• Test case 1 — FV transmission test and delay measurement 
• Test case 2 — False-positive test 
• Test case 3 — True positive test  
• Test case 4 — Test when there is an interfering vehicle (IV)  
• Test case 5 — Basic communication function test 

Furthermore, these test methods inform you about the alert approach with EEBL, which allows a vehicle to broadcast a self-generated emergency brake event to surrounding vehicles, reducing the potential danger of accident when a driver cannot see the brake light of a forward vehicle that is braking forcefully.