I agree with @scai that this is potentially risky: I don’t think aerial imagery can distinguish between a gravel road and an asphalt road with the same colour gravel top layer. However @Dimitar155 also has a point: only 1.6% of the republican road network is not asphalt so a high-level link road linking 2 asphalt roads is highly likely to be asphalt paved too. But I’d be very careful when it links to a minor road, or a road with unknown surface…
@Dimitar155 would be interesting to compare the NSI statistics with an OSM statistical query, to see if there are any discrepancies…
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