globals [ lights lights-time lights-limit north south west east ]
turtles-own [ speed deceleration acceleration from-direction to-direction ]
patches-own [ clear-in ]

to setup
  clear-all
  set-default-shape turtles "car"
  setup-constants
  setup-intersection
  set lights "north-south" ; allowed = dead-lights / east-west / north-south
  if dead-lights 
  [ set lights "dead-lights" ]
  switch-lights
  
  reset-ticks
end

to setup-constants
  ; the constants can be confusing and mean the opposite in some cases
  set north 180 
  set south 0
  set east 270
  set west 90
  
  set lights-time 0
end

to setup-intersection
  resize-world -15 15 -15 15
  
  ask patches
    [ set pcolor green - 1
      ; main dualways
      if abs pxcor = 3 or abs pxcor = 4
        [ set pcolor black ]
      if abs pycor = 3 or abs pycor = 4
        [ set pcolor black ]
      
      ; the intersection
      if abs pxcor < 5 and abs pycor < 5 and abs pxcor >= 3 and abs pycor >= 3 
        [ set pcolor gray ]
    ]
end

to switch-lights
  if lights = "north-south"
  [ 
    set lights "east-west"
    draw-lights green red
    set lights-time 0
    set lights-limit green-length-west-east
    stop
  ]
  
  if lights = "east-west"
  [ 
    set lights "north-south"
    draw-lights red green 
    set lights-time 0
    set lights-limit green-length-north-south
    stop
  ]
  
  if lights = "dead-lights"
  [ 
    draw-lights green green 
    ; nothing
  ]
end

to draw-lights [ east-west north-south ]
   
  ;TL-R
  ask patch -2 4 [ set pcolor east-west ]
  ask patch -2 3 [ set pcolor east-west ]

  ;TR-R
  ;ask patch 5 5 [ set pcolor east-west ]
  ask patch 5 4 [ set pcolor east-west ]
  ask patch 5 3 [ set pcolor east-west ]

  ;BL-L
  ask patch -5 -3 [ set pcolor east-west ]
  ask patch -5 -4 [ set pcolor east-west ]
  ;ask patch -5 -5 [ set pcolor east-west ]
  
  ;BR-L
  ask patch 2 -3 [ set pcolor east-west ]
  ask patch 2 -4 [ set pcolor east-west ]
  
  ;BR-B
  ask patch 3 -5 [ set pcolor north-south ]
  ask patch 4 -5 [ set pcolor north-south ]
 
  
  ;BL-T
  ask patch -4 -2 [ set pcolor north-south ]
  ask patch -3 -2 [ set pcolor north-south ]
  
  ;TR-B
  ask patch 3 2 [ set pcolor north-south ]
  ask patch 4 2 [ set pcolor north-south ]
  
  ;TL-T
  ask patch -4 5 [ set pcolor north-south ]
  ask patch -3 5 [ set pcolor north-south ]
end

to go
  move-cars
  make-new-cars
  
  set lights-time (lights-time + 1)
  
  if lights-time >= lights-limit
    [ ask patches with [pcolor = green]
      [ set pcolor yellow ]
    ]
    
  if lights-time >= lights-limit + yellow-length
    [ switch-lights ]
  
  tick
end

to make-new-cars-sub [probability xcoor ycoor headingdir]
  let rnd 10 ; dummy
  
  if (random-float 100 < probability)
  [
    if not any? turtles-on patch xcoor ycoor
    [
      crt 1
       [
         set xcor xcoor
         set ycor ycoor
         set heading headingdir
         set color 5 + 10 * random 14
         set speed speed-limit
         set from-direction headingdir   
         
         ; where is the destination
         set rnd random 100 
         let chance-north destination-north * 100 / ( destination-north + destination-west + destination-south + destination-east )
         let chance-east destination-east * 100 / ( destination-north + destination-west + destination-south + destination-east )
         let chance-west destination-west * 100 / ( destination-north + destination-west + destination-south + destination-east )
         let chance-south destination-south * 100 / ( destination-north + destination-west + destination-south + destination-east )
         
         if rnd >= 0
         [ set to-direction north ]
         if rnd >= chance-north
         [ set to-direction east ]
         if rnd >= chance-north + chance-east
         [ set to-direction west ]
         if rnd >= chance-north + chance-east + chance-west
         [ set to-direction south ]
         
         
         ; forbidding turning around on the intersection. I don't recommend it because there is a high chance cars will turn around on the intersections
         if not allow-turning-around-on-intersection
         [
           if ( from-direction = north and to-direction = south ) or ( from-direction = south and to-direction = north )
           [ set to-direction from-direction ]
           if ( from-direction = east and to-direction = west ) or ( from-direction = west and to-direction = east )
           [ set to-direction from-direction ]
         ]
       ]  
    ]
  ]

end

to make-new-cars
  
  make-new-cars-sub (freq-north) (-4 + random 2) max-pycor north 
  
  make-new-cars-sub (freq-south) (3 + random 2) min-pycor south 
  
  make-new-cars-sub (freq-west) min-pxcor (-4 + random 2) west
  
  make-new-cars-sub (freq-east) max-pxcor (3 + random 2) east
  
end

to move-cars
  ask turtles [ move ]
  check-for-collisions
end

to move ;; turtle procedure
  let clear-to clear-ahead
  
  if heading != to-direction and abs pxcor < 5 and abs pycor < 5 and abs pxcor >= 3 and abs pycor >= 3 
  [
    ; slowdown in the intersection
    if abs pxcor < 5 and abs pycor < 5 
    [ set clear-to min (  list 3 clear-to ) ]
  ]
  
  ; accelerate / deccelerate  
  ifelse clear-to > speed
  [ if speed < speed-limit
    [ set speed speed + min (list max-accel (clear-to - 1 - speed)) ] ;; accelerate
    if speed > speed-limit
    [ set speed speed-limit ] ;; but don't speed
  ]
  [ set speed speed - min (list max-brake (speed - (clear-to - 1))) ;; brake
    if speed < 0 [ set speed 0 ]
  ]
  
  ; going wrong and on a turn?
  if heading != to-direction and abs pxcor < 5 and abs pycor < 5 and abs pxcor >= 3 and abs pycor >= 3 
  [
    ifelse (heading = north) and (to-direction = west ) and pycor >= 2 
    [ rt 90 ]
    [if heading = south and pxcor >= 3 and pycor >= 3 
    [ lt 90 ]
    ]
    
    ifelse (heading = west) and (to-direction = south ) and pxcor <= -2
    [ rt 90 ]
    [if heading = east and pxcor <= -3 and pycor >= 3 
    [ lt 90 ]
    ]
    
    ifelse (heading = east) and (to-direction = north ) and pxcor >= 2
    [ rt 90 ]
    [if heading = west and pxcor >= 3 and pycor <= -3 
    [ lt 90 ]
    ]
    
    ifelse (heading = south) and (to-direction = east) and pycor <= -2 
    [ rt 90 ]
    [if heading = north and pxcor <= -3 and pycor <= -3 
    [ lt 90 ]
    ]
  ]
  
  repeat speed ;; move ahead the correct amount
  [
    if ( not any? turtles-on patch-ahead 1 )
    [ 
      fd 1
    ]
    
    if not can-move? 1
    [ die ]
    
    
    if pcolor = orange
    [ set clear-in 5  ;; if you hit an accident you cause another one
      die
    ]
  ]
 
end

to check-for-collisions
  ask patches with [ pcolor = orange ]
  [ set clear-in clear-in - 1
    if clear-in = 0
    [ set pcolor black ]
  ]
  ask patches with [ count turtles-here > 1 ]
  [
    set pcolor orange
    set clear-in 5
    ask turtles-here [ die ]
  ]
end

to-report clear-ahead ;;turtle procedure  
  let n 1
  repeat max-accel + speed  ;; look ahead the number of patches that could be travelled
  [ if patch-ahead n != nobody
    [ if([pcolor] of patch-ahead n = red) or
        ([pcolor] of patch-ahead n = orange) or
        (any? turtles-on patch-ahead n)
      [ report n ]
      set n n + 1
    ]
  ]
  report n
end

; See Info tab for full copyright and license.
@#$#@#$#@
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"westbound" 1.0 0 -7500403 true "" "plot count turtles with [heading = 270 and speed = 0]"
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SLIDER
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allow-turning-around-on-intersection
allow-turning-around-on-intersection
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SWITCH
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dead-lights
dead-lights
1
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@#$#@#$#@
## WHAT IS IT?

In this model the turtles are cars traveling through an intersection based on the following real intersection, see the map at http://goo.gl/maps/BkaAm .  The user has the ability to control the frequency of cars coming from each direction, the speed of the cars, acceleration, decceleration and the timing of the light at the traffic intersection.  

Real measured and approximated frequency of incomming cars are following:
northbound - 4
westbound - 48
southbound - 4
eastbound - 54

Real lights timings measured and approximated are following:
north-south - 10s
yellow - 3s
east-west - 30s

## HOW IT WORKS

The rules for each car are:  
- I can exit which direction I want to, it can be prohibited to turn-around and the intersection.
- I stop for cars in front of me and red lights, and I slow down at a yellow light.  
- If I am moving quickly and I see that I will have to stop soon, I slow down proportional to the distance of non-free space up to MAX-BRAKE.  
- If I see that I have free space in front of me, I speed up proportional to the amount of free space up to MAX-ACCEL.  
- If I am on the same space as another car, we crash and die.

## HOW TO USE IT

WAITING-OVERALL shows how many cars are waiting during the given clock tick.  
WAITING-EASTBOUND shows how many eastbound cars are waiting during the given clock tick. 
WAITING-SOUTHBOUND shows how many southbound cars are waiting during the given clock tick. 
WAITING-WESTBOUND shows how many westbound cars are waiting during the given clock tick. 
WAITING-NORTHBOUND shows how many northbound cars are waiting during the given clock tick.

CLOCK shows how many ticks have elapsed.

Use the FREQ-EAST slider to select how often new eastbound cars travel on the road.  
Use the FREQ-NORTH slider to select how often new northbound cars travel on the road.
Use the FREQ-WEST slider to select how often new westbound cars travel on the road.
Use the FREQ-SOUTH slider to select how often new southbound cars travel on the road.

Use the SPEED-LIMIT slider to select how fast the cars will travel.  
Use the MAX-ACCEL slider to determine how fast the cars can accelerate.  
Use the MAX-BRAKE slider to determine how fast the cars can decelerate.

Use the green-length-north-south slider to set how long the light will remain green in north-south direction.  
Use the green-length-west-east slider to set how long the light will remain green in east-west direction.  
Use the YELLOW-LENGTH slider to set how long the light will remain yellow.

If you change DEAD-LIGHTS you have to re-setup the model.

Press GO ONCE to make the cars move once.  
Press GO to make the cars move continuously.  
To stop the cars, press the GO button again.

## THINGS TO NOTICE

If the lights and cars frequency doesn't correlate, it creates jams on the intersection.

If you turn kill the lights intersection becomes way more "effective". Why are there the lights?

## EXTENDING THE MODEL

Allow cars to change lane on the road.

Allow cars to change lane in the intersection if the other lane is jammed.

Implement some kind of prediction wheter to enter the intersection or not if it seems overwhelmed.

In the model, the yellow light is only for visual effect.  In real life, it tells cars that they need to start braking if they're going to be able to stop before the light turns red.  Make the cars use this information, and see how it affects the model.

Is there a better way to measure the efficiency of an intersection than the current number of stopped cars?

Would the waiting times be better if this was a roundabout instead of an intersection?

## MODEL IS BASED ON 
* Wilensky, U. (1998).  NetLogo Traffic Intersection model.  http://ccl.northwestern.edu/netlogo/models/TrafficIntersection.  Center for Connected Learning and Computer-Based Modeling, Northwestern Institute on Complex Systems, Northwestern University, Evanston, IL.
* Wilensky, U. (1999). NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern Institute on Complex Systems, Northwestern University, Evanston, IL.
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