The road intersection is the cross road junction between a main road and a minor road. The main

road is called Railway Parade and the minor road is called East Street. East Street has two lanes,

one for each direction, with cars entering the junction from East Street being able to turn both left

and right.

Railway Parade has two lanes entering the intersection from both the northbound and southbound

directions. There is one through lane, and a dedicated right hand turn lane. When a right hand

turning lane has a green light then the opposite through lane must be displaying a stop light. If there

is NO light showing on a turning lane then traffic can turn with care if there is no oncoming traffic.

When traffic is exiting East Street, no traffic should be allowed to enter the intersection from

Railway Parade.

East Street Railway Junction

East Street crosses a railway level crossing. Traffic on East Street is controlled by lights and gates

for the level crossing When a train is approaching the two signal lights start to flash in an

alternating pattern, with each light being on when the other is off. The gate starts to close after the

light pattern is established and must be closed before the train passes. When the level crossing is

activated the main cross road intersection$$s behaviour should be modified to reduce the number of

cars entering East Street, and to allow any cars on East Street to exit through the intersection. This

is designed to enable the cars waiting for the lights to drain in case there were cars illegally queued

on the train tracks.

Minimum System Requirements

These requirements, if fully implemented will results in a credit grade.

Operation of the Controller:

The controller must initialise itself in the Hazard phase. In the Hazard phase, all lights in the

system are off except for the nominated lights. These nominated lights flash simultaneously in an

alternate on$/$off fashion. The nominated lights are all on for one second then all off for one second.

All non$-$nominated lights remain off at all times during hazard phase. The nominated lights at the

intersection are the car yellow lights on Railway Parade and the car yellow lights on East Street.

After $10$ s in the Hazard phase, your system will move to normal operation, initially allowing

through traffic on Railway Parade between north and south. During normal operation, one of the

following traffic phases of the intersection should occur:

East Street Through $($EST$)$: Traffic is allowed to proceed from both sides of East Street into the

intersection.

Railway Parade Right Turn $($RPR$)$: One or both of the right turn lanes on Railway Parade are

green.

Railway Parade Straight $($RPS$)$: The car lanes that allow traffic on Railway Parade to go straight

can proceed. The extensions may add additional flows to this state.

Note that turning and straight phases are acceptable, and additional phases may need to be added.