A new EU-funded project— HIDDEN (Hybrid Intelligence for Advanced Collective Perception and Decision Making in Complex Urban Environments) officially launched on July 8^th, in Athens. Its mission? To make European cities safer by enabling automated vehicles better detect what they currently can’t see— pedestrians, cyclists, and other road users hidden behind obstacles.

Coordinated by the Institute of Communication and Computer Systems (ICCS) and funded by a grant of approximately €5 million under Horizon Europe’s Cluster 5, HIDDEN is supported by the Connected, Cooperative and Automated Mobility (CCAM) Partnership. Over the next 36 months, the project will bring together 14 partners and 2 affiliated entities across 7 EU countries to tackle a key challenge in urban mobility: occlusions. In bustling city environments, parked cars, buildings, and even vegetation can obstruct a vehicle’s sensors, creating blind spots, that pose serious risks, especially for vulnerable road users (VRUs) like children, cyclists, or road workers. Current detection systems often struggle in such scenarios, with VRU recognition rates dropping below 65% when individuals are fully occluded.

HIDDEN addresses this challenge by leveraging and enhancing Collective Awareness using Vehicle-to-Everything (V2X) communication —where vehicles and infrastructure share sensor data – and artificial intelligence. This allows vehicles to build a more complete picture of their surroundings, collectively interpreting data from other vehicles, infrastructure, and even road users to see beyond what their own sensors can detect. What truly sets HIDDEN apart is the use of Hybrid Intelligence (HI)—a fusion of human and machine intelligence. This approach allows automated vehicles to not only detect hidden objects but also make decisions that are ethically and legally grounded and aligned with human behaviour.

“HIDDEN goes beyond conventional AI,” said Dr. Angelos Amditis, HIDDEN Coordinator and R&D Director at ICCS. “We’re bringing human judgement into the loop—so automated systems can act not just accurately, but wisely. By blending the precision of machines with human context, awareness, and ethics, we aim to make urban transport not only smarter but also safer and more socially attuned.

To test its approach, HIDDEN will focus on four high-risk urban scenarios: a child running from behind a parked car, a cyclist in mixed-traffic zones, a road worker obscured by vegetation, and a vehicle hidden at an unsignalised intersection. Each case reflects complex, real-world challenges where improved perception and ethically grounded decision-making could prove life-saving.

Beyond technical performance, HIDDEN’s CCAM systems are being designed to reflect human driving styles, uphold ethical standards, and meet emerging regulatory requirements. The project will also work closely with stakeholders, including EU type approval bodies and UNECE working groups, to align its results with future standards and policy development.

HIDDEN brings together a diverse group of partners with complementary strengths. The consortium includes leading research institutes and universities, SMEs specialising in AI and machine learning, major players in the automotive sector, type approval authorities, social science researchers, and industry associations involved in standardisation. This multidisciplinary team ensures that technical development is informed by real-world needs, regulatory insight, and a strong understanding of human and social factors—covering the full path from research to implementation.

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