What are alternative intersection designs and when are they appropriate?

Alternative intersections improve capacity and safety through unconventional geometry: (1) Displaced left turns (DLT/CFI) - lefts cross opposing traffic before intersection, eliminating left-turn phase, (2) Diverging Diamond (DDI) - traffic crosses to opposite side between ramps, eliminating left-turn conflicts, (3) Restricted Crossing U-turn (RCUT/Superstreet) - minor street lefts/throughs use U-turns on main road, (4) Median U-turn (MUT) - indirect lefts via downstream U-turn. Selection based on traffic patterns (high through vs. left demands), safety benefits (reduced conflict points), available ROW, and driver familiarity. Simulation essential for operational analysis.