Sometimes when riding gravel races (which mostly follow roads laid out on the Jeffersonian grid), I would come to a T intersection. I never really thought about why this happens, but Gerco de Ruijter has turned it into an art project:
By superimposing a rectangular grid on the earth surface, a grid built from exact square miles, the spherical deviations have to be fixed. After all, the grid has only two dimensions.
The north-south boundaries in the grid are on the lines of longitude, which converge to the north. The roads that follow these boundaries must dogleg every twenty-four miles to counter the diminishing distances: Grid Corrections.