  The rise of online meal delivery has led to a surge in delivery traffic to
urban neighborhoods, resulting in issues such as increased traffic congestion,
illegal parking, noise, and air pollution. This paper introduces and analyzes a
novel meal delivery strategy that incorporates a microhub. In this approach,
the service area is segmented into smaller sub-areas, with deliverers assigned
to operate exclusively within these sub-areas. The microhub functions as a
transfer depot, enabling the batching and transfer of orders toward different
sub-areas. To evaluate this system's performance, two critical metrics --
customer waiting time and vehicle miles traveled -- are estimated through the
continuous approximation approach. Comprehensive numerical experiments are
conducted to validate the accuracy of our approximations. The derived
analytical approximation is then integrated into an optimal design problem to
determine the optimal number of sub-areas and the optimal batch size of
packages within each sub-area. The numerical results suggest that the meal
delivery system with a microhub outperforms the traditional pickup and delivery
mode in both metrics, under either high demand or low supply conditions. The
higher efficiency of the microhub design is attributed to the strategy of
sub-regional batching, facilitated by the use of the microhub.
