Three new automakers – Subaru, Nissan, and Mazda – will participate in Japan's D-Call Net system which comprises the non-profit Emergency Medical Network of Helicopter (HEM-Net), auto manufacturers, and service providers.

Now nine organisations will contribute to improvements in the survival rate of traffic accident victims throughout Japan.

D-Call Net, an AACN (Advanced Automatic Collision Notification), is a system which uses vehicle connectivity technology. It estimates the probability of fatal and serious injuries by making an automatic analysis of data at the time a traffic accident occurs based on an algorithm using approximately 2.8m accident data cases in Japan as a base.

This data is reported to all of Japan's approximately 730 fire departments, as well as 46 air ambulance services and 54 cooperating hospitals in 37 prefectures, with the aim of increasing the number of lives saved after traffic accidents by making immediate air and ground ambulance dispatch decisions.

In order to accurately and promptly implement a flow of "traffic accident – transportation – start of medical treatment", in 2011 a group of organisations centering on HEM-Net, Toyota, Honda, and Japan Mayday Service began accumulating data and designing algorithms, and subsequently established D-Call Net; the companies then conducted an operational trial beginning in November 2015.

With the cooperation of relevant agencies such as fire departments and hospitals, full-scale nationwide operations commenced in June 2018. Research shows that D-Call Net can reduce the time it takes for traffic accident victims to receive first contact with a medical professional  by approximately 17 minutes; other findings indicate that if D-Call Net was in all vehicles on Japanese roads, the number of road traffic fatalities could be reduced by 282 people every year.