  The main contribution reported in the paper is a novel paradigm through which
mobile cellular traffic forecasting is made substantially more accurate.
Specifically, by incorporating freely available road metrics we characterise
the data generation process and spatial dependencies. Therefore, this provides
a means for improving the forecasting estimates. We employ highway flow and
average speed variables together with a cellular network traffic metric in a
light learning structure to predict the short-term future load on a cell
covering a segment of a highway. This is in sharp contrast to prior art that
mainly studies urban scenarios (with pedestrian and limited vehicular speeds)
and develops machine learning approaches that use exclusively network metrics
and meta information to make mid-term and long-term predictions. The learning
structure can be used at a cell or edge level, and can find application in both
federated and centralised learning.
