# Connected vehicle collision avoidance Topic radar · 1,378 documents · 2021-01-01–2026-11-08 · updated 2026-11-08 Canonical: https://slate.greyb.com/radar/connected-vehicle-collision-avoidance/innovations ## In one minute ### Nothing here is one device, and every part answers to a deadline A connected collision warning is a chain of four jobs. Something detects an object, something puts that object into a message another vehicle can use, the receiving car reconciles it with what its own sensors see, and then something decides whether to warn or brake. Different groups of filers claim each stage, and one number bounds the whole chain: the warning has to arrive while there is still time to act. The earliest patents assume the chain is one link long. The vehicle broadcasts its position and speed several times a second, the receiver matches that against the intersection geometry and checks a safety distance [1] [2]. Everything since has been about adding links. 1. [CN113593273A](/?paper=CN113593273A&utm_source=radar&utm_medium=dashboard) 2. [KR102569873B1](/?paper=KR102569873B1&utm_source=radar&utm_medium=dashboard) ### The purchase order is a compliance date Nothing in the news shows a buyer choosing connected collision avoidance because a trial proved it prevents crashes. What the news shows is equipment being forced out by calendar. ### Patents have grown fourfold while paper output flattened Patents published in this field rose from 65 in 2021 to 266 by 23 October 2026. Papers climbed to 115 in 2025 and have fallen back since, at 66 over the same ten months. The current year is counted only to 23 October. ### The message stopped describing the sender and started describing the road The Basic Safety Message carries where the sender is. A collective perception message carries what the sender has seen: object type, position, velocity and size, expressed in a frame the receiver can interpret. ETSI standardised this as a second-generation V2X service, and the evaluation literature now treats the perception pipeline that produces those objects as the part that decides performance. ### China's commercial-vehicle rule is the volume channel the news describes China has published the component standard its vehicle side will be judged against, GB/T 45315-2025, covering environmental, positioning, receiver-sensitivity and communication-security requirements for LTE-V2X on-board systems. A draft mandatory standard from the Ministry of Transport's Highway Research Institute would then require new operating buses, trucks and tractor-trailers, excluding trailers, to carry LTE-V2X direct-communication terminals from the factory. Industry coverage puts the covered volume at roughly 2.1 to 2.5 million new commercial vehicles a year. ### The growth has moved from the radio to the decision layer Communication work is the one area that has stopped climbing. It reached 107 documents in 2025 and stands at 95 for the partial 2026. Perception went from 90 to 134 over the same comparison, and decision and control went from 42 in 2024 to 83 in 2025 and 109 by late October 2026. ### The measurement problem moved into the roadside's coordinate frame To place a roadside detection in a car's own frame, three things have to agree: the clock, the geometry and the pose. Filings specify pulse-per-second timing, a pose transform transmitted over V2X so the infrastructure can express a target in the vehicle's coordinates, and mounting geometry held to a tenth of a degree. ### What is selling now is retrofit, proof of concept and letters of intent The transactions in the news are small and mostly not purchases of the safety function. ## Overview Connected collision avoidance has become two technologies moving at different speeds. One is a radio link and a message format, which now has measured latency, an installed base, a certification regime and a legal deadline forcing old equipment out. The other is the judgement about whether a detected object actually matters, which is where the invention has gone and where almost no field evidence exists. The distance between those two halves decides who can sell what to whom. ## What's new India has now put dates on both halves of collision avoidance — factory-fitted vehicle-to-vehicle units in new vehicles from 1 October 2028, automatic emergency braking on new cars from 1 October 2030. Both are drafts, and the earlier date is the one that changes the engineering problem. ## Research ### Fusion runs at two levels, and they cost different amounts The simple version exchanges finished object lists and merges them. The ambitious version exchanges point clouds or feature maps and fuses before detection, which buys accuracy and spends bandwidth and latency. A Tongji comparison across early, feature and late fusion concludes the choice turns on how suddenly objects appear and how fast they move, favouring late fusion in fast, unpredictable scenes and early fusion where precision matters most. ### The delay has been measured, and the first sighting is the slow part This is the part of the chain with real numbers. On an ETSI-compliant roadside unit prototype, information reached the vehicle in 157 ms for an object already being tracked and 250 ms for one seen for the first time. An infrastructure-based collective perception system integrated into an open driving stack delivered in about 30 ms end to end, with a second radio channel holding the link when one lost a large share of its packets. A scaled robotic testbed spanning camera, edge node, roadside unit, vehicle and actuator put detection-to-action under 100 ms. ### The decision end is an envelope, and the envelope is deliberately conservative The receiving car keeps authority and uses the message as one more input. Bosch's connected brake applies a partial deceleration on a vehicle-to-everything message and leaves the emergency stop to the vehicle's own sensors. Beijing Electric Vehicle tests a cloud-optimised trajectory against a distance and force envelope and takes over when the envelope is breached. DAF passes the larger of two decelerations to the brake controller. Guangdong Luquan scores a local and a cloud decision for credibility before combining them. ### The links with measurements are the transport, the alignment and the delivery The honest reading of this chain is uneven. Moving a message, aligning two frames and delivering inside the budget are demonstrated on hardware and reported against the requirement. The perception feeding them is usually modelled as ideal. When a realistic detector was substituted for the ideal one in a collective perception simulation, the system reached roughly 42% of the ideal detection capability. ## Market ### The licence money is collected at the modem This is the most consequential thing the market evidence says about the patent estate. ### The roadside vendor holds the signed contract, and the vehicle feature remains unbought The one contract type with a named buyer and a named seller in this news is roadside. Greeley, Colorado awarded a Kapsch distributor work to help emergency vehicles pass intersections; Colorado's transport department selected Yunex Traffic for 150 roadside units as one of two vendors. Neither requires fleet penetration, and preemption requires no negotiation between ordinary vehicles at all. ## Strategy ### No organisation holds more than about one per cent of it The largest holders in the field sit at fifteen documents each, out of roughly 1,360. There is no incumbent. That changes what a patent position is worth here: it buys a seat at standards work and a negotiating chip, and it does not buy control of a route to market. ### The brake suppliers have arrived at the junction the universities had to themselves Decision and control is the only area where companies and universities are level, at 110 documents against 169 combined academic and education. In the earlier filings that area was mostly a university problem. Kunming split intersection control into an upper planning layer and a lower predictive layer. Chongqing grouped connected and human-driven vehicles into mixed platoons governed by a game. Jilin modelled an overtaking negotiation against an oncoming car. ### The organisations that grade warnings have started patenting the grading Validation and deployment is the smallest substantive area at 45 documents. Twenty-eight of those are patents and nine are papers, so even the measurement layer is being claimed privately. ## Areas - Perception & Sensing · 466 documents - Communication & Networking · 470 documents - Decision & Control · 332 documents - Validation & Deployment · 45 documents - Policy & Governance · 27 documents