It is indeed noticeable that regions containing a high concentration of accidents generally show redder colors, meaning that these cells have their nearest accident closer. The light blue regions, particularly at the south of the municipality, do however show some erroneous information. These zones being located where the residues were the highest this discrepancy is not surprising.
Considering the first law of geography by Tobler stating that near things are more correlated than distant things (Tobler, 1970),  taking the neighboring cells into consideration seems of importance. A multivariate regression with dependent spatially weighted variables was therefore executed. Different weighting methods were tested, the optimal one being the Queen weighting with contiguity of order 1. The results obtained using this scheme are presented in Fig. 6.