Nissan has been working on a new way to help reduce traffic congestion, and it doesn’t rely on the usual vehicle-to-vehicle communication tech like V2V or DSRC. Instead, they’re using their existing driver assist system, ProPilot Assist, in an innovative way to keep traffic flowing smoothly.

Recently, Nissan teamed up with the Contra Costa Transportation Authority and UC Berkeley for a pilot project on I-680 in the Bay Area. The goal was to see if their system, called “Cooperative Congestion Management,” could make driving in traffic less frustrating. Over about 600 miles of testing, they found some promising results. The system cut down on sudden braking events by 85% and reduced the time cars spent stopped in traffic by 70%.

How the System Works

Unlike the idea of autonomous trucks driving in a convoy, Nissan’s CCM isn’t about cars following each other blindly. Instead, it uses a clever approach where a lead car, or “probe,” sends out information about its speed and any hazards to the cars behind it. These cars are not directly talking to each other; instead, they communicate through the cloud using LTE modems built into the vehicles.

As the cars receive this data, they adjust their speed and distance accordingly. This helps prevent the typical stop-and-go traffic pattern that human drivers often cause when they brake suddenly or cut in front of others. The cars keep a safe following distance—between 30 and 60 seconds—and decelerate gently if they detect slowing traffic ahead.

More Than Just Tech for Traffic Flow

This isn’t about creating a fully autonomous platoon of cars. Instead, it’s a mixed system that works alongside human drivers, with some cars equipped with CCM and others not. Nissan’s senior researcher, Jerry Chou, explained that the system balances parameters to ensure the following cars don’t brake too hard or too gently, maintaining smooth traffic flow.

Instead of using the outdated DSRC radios that automakers once favored, Nissan’s cars communicate via LTE through the cloud. This approach leverages existing cellular networks, making it easier to implement without waiting for new infrastructure.

Chou mentioned that even with just 4-5% of cars in traffic using CCM, noticeable improvements can occur. The system’s benefits increase as more vehicles adopt it, but even a small percentage can help reduce congestion. Still, since this was a small-scale test, Nissan is exploring ways to better control and refine the system to see more consistent results.

Looking Ahead

Future upgrades for CCM could include providing drivers with feedback on why their cars are slowing down, helping them understand and trust the system. This could prevent drivers from manually overriding the system’s decisions, which might reduce its effectiveness.

If Nissan’s pilot continues to show positive results, the company is open to licensing the technology to other automakers. The goal is to create a system that works across different brands and vehicles, potentially easing traffic jams in many cities.

This approach shows that automakers don’t always need to wait for new, complicated tech to solve old problems. Sometimes, smart use of existing systems and cloud communication can make a big difference in our daily commutes.

Inspired by

• https://arstechnica.com/cars/2025/09/how-nissan-leveraged-its-driver-assist-to-cut-traffic-jams/

Sources

• conde.digital
• cnevids.com