All thoroughfares shall be continuous or in alignment with existing streets, unless variations are deemed advisable by the P&Z and City Council after consideration of the recommendations made by the City Engineer. Off-center street intersections (in which intersections are closer than 200 feet for thoroughfares or 100 feet for residential streets) shall not be approved except in unusual cases. Parkways and boulevards shall be of such width as may be designated by the P&Z. More than two (2) streets intersecting at one point shall be avoided except where it is impractical to secure a proper street system otherwise. Where several streets converge at one point, setback lines, special rounding or cutoff of corners and/or a traffic circle may be required to insure safety and facility of traffic movement. No street shall intersect any other street at an angle of less than seventy-five (75) degrees.