What would be a suitable representation for a wide road in a GIS model?

A wide road is best represented as a line feature in a GIS model because lines are ideal for depicting linear features such as roads, rivers, and paths, which have length but minimal width on a map. In GIS, line features can also have associated attributes, such as road type, speed limit, and traffic conditions, making them versatile for spatial analysis and cartographic representation.

While polygons could represent a wide road if they're used to depict the actual area the road covers, line features are typically preferred for their simplicity and efficiency in representing the road’s geometry. Points are useful for representing discrete locations, such as intersections or landmarks, but they do not convey the dimensionality of a road. Raster grids are typically used for continuous data or representing surface information rather than discrete linear features like roads. Thus, the best representation in this case is a line feature.