What technical requirement must an approved cross-traffic front camera system (Querverkehrskamera) fulfil to replace a physical guide person on tractors with front overhang > 3.50 m?

1. The camera must be fitted on the tractor cab roof, looking forward over the implement
2. A single rear-view reversing camera screen is sufficient
3. An uncertified action camera with a mobile phone as the monitor is sufficient
4. The cameras must sit at the foremost edge of the implement and show the driver a live view of the traffic approaching from both left and right on an in-cab monitor