The LEGO Friends Traffic subtheme includes sets that focus on transportation and service vehicles in Heartlake City. Key sets in this subtheme are 41694 Heartlake City Hospital Ambulance (2022), featuring an ambulance with medical equipment and a hospital; 41379 Heartlake City Restaurant (2019), which includes a hot dog truck; and 41712 Recycling Truck (2022), which includes a recycling truck with sorting bins. These sets emphasize community services and everyday city activities, showcasing the infrastructure and support systems in Heartlake City.