  This extended abstract describes our solution for the Traffic4Cast Challenge
2019. The key problem we addressed is to properly model both low-level (pixel
based) and high-level spatial information while still preserve the temporal
relations among the frames. Our approach is inspired by the recent adoption of
convolutional features into a recurrent neural networks such as LSTM to jointly
capture the spatio-temporal dependency. While this approach has been proven to
surpass the traditional stacked CNNs (using 2D or 3D kernels) in action
recognition, we observe suboptimal performance in traffic prediction setting.
Therefore, we apply a number of adaptations in the frame encoder-decoder layers
and in sampling procedure to better capture the high-resolution trajectories,
and to increase the training efficiency.
