Aiming at the problems of insufficient research, imperfect specification and limited application of new unconventional level crossing in China, the geometric layout and signal control of USC parallel flow unconventional level crossing are studied. According to the traffic organisation mode of USC to determine the signal coordination principle of USC, based on the traffic flow shock wave theory to analyse the queuing situation at each stop line of USC, to establish equations based on the time relationship and distance relationship generated by the traffic flow running in the range of the level crossing, and to establish constraints for solving. Through the input of traffic parameters, the length of left-turn lane, signal cycle length, green light duration and signal phase difference between primary and secondary level crossings of USC level crossing are obtained, and then the geometric design and signal coordination design of USC level crossing are carried out. Finally, based on the traffic data survey and VISSIM simulation model, the conventional level crossing and USC non-conventional level crossing are compared and analysed, and three types of evaluation indexes, namely, access efficiency, safety and traffic sustainability, are selected for evaluation. The results show that, in terms of access efficiency, the USC scheme can effectively reduce delays and queues, and the degree of improvement in travel time increases with the increase in traffic volume; in terms of safety, the USC scheme has fewer conflicts, a higher TTC index, a lower probability of collision, a lower DeltaS index than the conventional scheme, and a less severe degree of conflict, so the USC is safer; in terms of traffic sustainability, under low traffic volume conditions, the USC scheme is better than the conventional scheme, and the USC scheme is better than the conventional scheme in terms of safety. In terms of traffic sustainability, the environmental improvement effect of USC is poorer under low traffic conditions, but under heavy traffic conditions, the fuel consumption and emission of USC are lower, which indicates that USC is more environmentally friendly when the traffic volume is high. In conclusion, USC has better application prospects in heavy traffic load scenarios and has field construction value.