You are an engineer tasked with designing a sophisticated traffic signal control system

for an urban four$-$way intersection. This intersection includes a high$-$speed main road

$($North$-$South$),$ a lower$-$speed minor road $($East$-$West$),$ dedicated left and right turn

lanes, pedestrian crossings at all corners, and bicycle paths. Determine optimal locations

for vehicle, pedestrian, and bicycle detection devices. Draw your design in the figure.