  In monitoring, we algorithmically check if a single behavior satisfies a
property. Here, we consider monitoring for Multi-Lane Spatial Logic (MLSL). The
behavior is given as a finite transition sequence of MLSL and the property is
that a spatial MLSL formula should hold at every point in time within the
sequence. In our procedure we transform the transition sequence and the formula
to the first-order theory of real-closed fields, which is decidable, such that
the resulting formula is valid iff the MLSL formula holds throughout the
transition sequence. We then assume that temporal data may have an error of up
to $\varepsilon$, and that spatial data may have an error of up to $\delta$. We
extend our procedure to check if the MLSL formula
$\varepsilon$-$\delta$-robustly holds throughout the transition sequence.
