;;netlogo sim - timm03
globals [
  ;; Sliders / Switch in Interface:
  ;;   - number-of-cars      (int)
  ;;   - road-spacing        (int)
  ;;   - base-speed          (float)
  ;;   - driver-error-rate   (float)
  ;;   - accident-duration   (int)
  ;;   - traffic-lights?     (boolean switch)

  ;; Statistics
  total-cars-reached-destination
  total-cars-accident         ;; how many cars died in accidents (cumulative)
  accident-count              ;; how many total accidents have started
  average-speed
  average-congestion
  accident-percentage
  sum-travel-time           ;; sum of time in system for all cars that exit
  count-completed-cars      ;; how many cars reached destination
  average-travel-time       ;; output metric
  accident-count-good
  accident-count-bad
  accident-count-very-bad
   sum-time-until-accident
  sum-distance-until-accident
  average-time-until-accident
  average-distance-until-accident
]

patches-own [
  is-road?           ;; boolean: is this patch part of a road?
  is-intersection?   ;; boolean: is this patch an intersection?
  lane-direction     ;; forced heading: 0, 90, 180, 270, or -1 if intersection
  traffic-light?     ;; does this patch have a traffic light?
  light-state        ;; true=green, false=red
  has-accident?      ;; boolean: accident currently on this patch?
  accident-lifetime  ;; integer: how many ticks remain for this accident?
  road-condition     ;; 0=good, 1=bad, 2=very bad (affects accident prob)
]

breed [ cars car ]
cars-own [
  speed
  max-speed
  stopped-ticks
  destination        ;; patch or nobody
  birth-tick                 ;; store the tick when the car is created
  distance-traveled          ;; accumulates how far the car has moved
]

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  1.  SETUP                                                   ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup
  clear-all

  ;; Initialize stats
  set total-cars-reached-destination 0
  set total-cars-accident 0
  set accident-count 0
  set average-speed 0
  set average-congestion 0

  set sum-travel-time 0
  set count-completed-cars 0
  set average-travel-time 0

  set accident-count-good 0
  set accident-count-bad 0
  set accident-count-very-bad 0

  set sum-time-until-accident 0
  set sum-distance-until-accident 0
  set average-time-until-accident 0
  set average-distance-until-accident 0

  setup-roads
  setup-intersections
  setup-traffic-lights
  setup-road-conditions

  reset-ticks

  create-initial-cars
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  2.  CREATE ROADS (TWO LANE, ONE-WAY)                        ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup-roads
  ask patches [
    set is-road? false
    set is-intersection? false
    set traffic-light? false
    set light-state false
    set has-accident? false
    set accident-lifetime 0
    set lane-direction 0
    set road-condition 0
    set pcolor green
  ]

  ;; 2-lane roads in x or y dimension
  let road-patches patches with [
    (abs pxcor mod road-spacing <= 1) or
    (abs pycor mod road-spacing <= 1)
  ]

  ask road-patches [
    set is-road? true
    set pcolor grey
  ]

  ;; Assign forced lane headings for non-intersection road patches
  ask road-patches [
    let x-road? (abs pxcor mod road-spacing <= 1)
    let y-road? (abs pycor mod road-spacing <= 1)

    ;; purely vertical lane: pick 0 or 180
    if (x-road? and not y-road?) [
      ifelse (pxcor mod 2 = 0)
        [ set lane-direction 0   ]   ;; "northbound"
        [ set lane-direction 180 ]   ;; "southbound"
    ]

    ;; purely horizontal lane: pick 90 or 270
    if (y-road? and not x-road?) [
      ifelse (pycor mod 2 = 0)
        [ set lane-direction 90  ]   ;; "eastbound"
        [ set lane-direction 270 ]   ;; "westbound"
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  3.  INTERSECTIONS                                           ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup-intersections
  ask patches with [is-road?] [
    let x-road? (abs pxcor mod road-spacing <= 1)
    let y-road? (abs pycor mod road-spacing <= 1)

    ;; Intersection = patch that is both x-road & y-road
    if (x-road? and y-road?) [
      set is-intersection? true
      set pcolor yellow
      set lane-direction -1   ;; means "all directions possible here"
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  4.  TRAFFIC LIGHTS                                          ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup-traffic-lights
  if traffic-lights? [
    ;; Turn on lights at each intersection
    ask patches with [is-intersection?] [
      set traffic-light? true
      set light-state true
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  5.  ROAD CONDITIONS                                         ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup-road-conditions
  let sum-prob (good-road-probability + bad-road-probability)

  ask patches with [is-road?] [
    let r random-float 1

    ifelse (r < good-road-probability) [
      ;; (1) "Good" road
      set road-condition 0
      set pcolor grey

    ] [
      ifelse (r < sum-prob) [
        ;; (2) "Bad" road
        set road-condition 1
        set pcolor (grey - 2)

        ;; 5% chance to become "Very Bad" instead:
        if random-float 1 < 0.05 [
          set road-condition 2
          set pcolor orange
        ]

      ] [

        set road-condition 0
        set pcolor grey
      ]
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  6.  CREATE INITIAL CARS                                     ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to create-initial-cars
  ask cars [ die ]  ;; remove any old cars

  let valid-starts patches with [
    is-road? and
    not has-accident? and
    not any? cars-here
  ]

  if not any? valid-starts [
    user-message "No valid road patches for car creation!"
    stop
  ]

  create-cars min list number-of-cars (count valid-starts) [
    set shape "car"
    set color blue
    set size 0.8

    ;; pick a random road patch
    let start-patch one-of valid-starts
    move-to start-patch
    set valid-starts valid-starts with [self != start-patch]

    ;; If this patch is an intersection => pick a direction
    ifelse ([lane-direction] of patch-here = -1)
      [ set heading one-of [0 90 180 270] ]
      [ set heading [lane-direction] of patch-here ]

    set speed 0
    set max-speed base-speed
    set stopped-ticks 0
    set destination nobody
    set distance-traveled 0
    set birth-tick ticks
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  7.  GO (MAIN LOOP)                                          ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to go
  if not any? cars [ stop ]

  update-traffic-lights
  move-cars
  check-accidents
  clear-old-accidents
  update-statistics

  tick
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  8.  UPDATE TRAFFIC LIGHTS                                   ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to update-traffic-lights
  if traffic-lights? [
    ask patches with [is-intersection? and traffic-light?] [
      ;; simple toggle every 30 ticks
      if (ticks mod 30 = 0) [
        set light-state not light-state
        set pcolor ifelse-value light-state [green] [red]
      ]
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;  9.  MOVE CARS                                               ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to move-cars
  ask cars [
    ;; Force lane direction
    let patch-lane [lane-direction] of patch-here

    ifelse patch-lane = -1 [
      ;; intersection => pick a new direction each tick or once
      set heading one-of [0 90 180 270]
    ]
    [
      ;; normal lane => enforce that heading
      set heading patch-lane
    ]

    ;; Decide if it's safe to move
    let safe-to-move? true

    ;; Check traffic light
    if [traffic-light?] of patch-here [
      if not ([light-state] of patch-here) [
        set safe-to-move? false
      ]
    ]

    ;; Check for cars ahead in same lane
    if any? cars-on patch-ahead 1 [
      set safe-to-move? false
    ]

    ;;  Move or slow
    ifelse safe-to-move? [
      set speed min (list (speed + 0.1) max-speed)
      forward speed
      set distance-traveled distance-traveled + speed
      set stopped-ticks 0
    ] [
      set speed max (list (speed - 0.2) 0)
      set stopped-ticks (stopped-ticks + 1)
    ]

 ;; if the car leaves the grid:
    if not is-patch? patch-here [

      set count-completed-cars (count-completed-cars + 1)

      ;;  Add to sum-travel-time:
      set sum-travel-time (sum-travel-time + (ticks - birth-tick))

      ;; Then die
      die
    ]

    if (max-pxcor - abs xcor) < 1 or (max-pycor - abs ycor) < 1 [
      set total-cars-reached-destination (total-cars-reached-destination + 1)

      set count-completed-cars (count-completed-cars + 1)
      set sum-travel-time (sum-travel-time + (ticks - birth-tick))

      die
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; 10.  ACCIDENT LOGIC (EXPANDED)                               ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to check-accidents
  ;; For each car, compute probability of an accident
  ask cars [
    if random-float 1 < calculate-accident-probability self [
      create-accident self
    ]
  ]
end

to-report calculate-accident-probability [ c ]
  ;; Base accident probability from driver error
  let base (driver-error-rate * 0.00025)

  ;;  Find the patch under turtle c (using c's pxcor, pycor)
  let p patch ([pxcor] of c) ([pycor] of c)

  ;;  Road condition effect
  if [road-condition] of p = 1 [
    set base (base * 2)
  ]
  if [road-condition] of p = 2 [
    set base (base * 2.6)
  ]

  ;; Speed factor
  let speed-ratio ([speed] of c / [max-speed] of c)
  set base (base * (speed-ratio + 0.1))   ;; +0.1 so even slow cars have some chance

  ;; Congestion effect: how many other cars are within radius 1.5 of c
  let nearby-cars count cars with [ distance c < 1.5 ]
  set base (base + (nearby-cars * 0.0005))

  ;;  Intersection effect
  if [is-intersection?] of p [
    set base (base * 1.5)
  ]

  ;; Cap at 1% (0.01) to avoid extreme probabilities
  report min (list base 0.1)

end


to create-accident [ c ]
  set accident-count (accident-count + 1)
  set total-cars-accident (total-cars-accident + 1)

  ;; Mark the patch
  let px ([pxcor] of c)
  let py ([pycor] of c)
  ask patch px py [
    set has-accident? true
    set pcolor red
    set accident-lifetime accident-duration

    ;; Accidents by Road Condition:
    if (road-condition = 0) [ set accident-count-good (accident-count-good + 1) ]
    if (road-condition = 1) [ set accident-count-bad (accident-count-bad + 1) ]
    if (road-condition = 2) [ set accident-count-very-bad (accident-count-very-bad + 1) ]
  ]

  ;; Time & Distance to Accident:
  let time-until-accident (ticks - [birth-tick] of c)
  let dist-until-accident ([distance-traveled] of c)
  set sum-time-until-accident (sum-time-until-accident + time-until-accident)
  set sum-distance-until-accident (sum-distance-until-accident + dist-until-accident)

  ;; kill the car
  ask c [ die ]
end

to clear-old-accidents
  ;; Decrement accident-lifetime. When it hits 0, clear the patch.
  ask patches with [has-accident?] [
    set accident-lifetime (accident-lifetime - 1)
    if (accident-lifetime <= 0) [
      set has-accident? false
      ;; restore color based on road-condition
      if (road-condition = 0) [
        set pcolor grey
      ]
      if (road-condition = 1) [
        set pcolor (grey - 2)
      ]
      if (road-condition = 2) [
        set pcolor orange
      ]
    ]
  ]
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; 11.  STATISTICS & PLOTS                                      ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to update-statistics
  let car-count count cars
  let total-speed 0

  if car-count > 0 [
    set total-speed sum [speed] of cars
    set average-speed (total-speed / car-count)
  ]
  if car-count = 0 [
    set average-speed 0
  ]


  set average-congestion count cars with [
    (stopped-ticks >= 2) and (any? cars-on patch-ahead 1)
  ]
   if number-of-cars > 0 [
    set accident-percentage ((accident-count / number-of-cars) * 100)
  ]
  ;;Average travel time for cars that completed trip
  if count-completed-cars > 0 [
    set average-travel-time (sum-travel-time / count-completed-cars)
  ]
  ;;Averages for time & distance until accident
  if accident-count > 0 [
    set average-time-until-accident (sum-time-until-accident / accident-count)
    set average-distance-until-accident (sum-distance-until-accident / accident-count)
  ]
  ;; Plot them
  carefully [
    set-current-plot "Average Speed"
    plot average-speed

    set-current-plot "Total Accidents"
    plot accident-count

    set-current-plot "Average Congestion"
    plot average-congestion
  ] []
end
@#$#@#$#@
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Average speed
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@#$#@#$#@
## WHAT IS IT?

(a general understanding of what the model is trying to show or explain)

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
@#$#@#$#@
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Polygon -7500403 true true 135 180 90 135 45 120 75 180 135 210
Polygon -7500403 true true 165 180 165 210 225 180 255 120 210 135
Polygon -7500403 true true 135 105 90 60 45 45 75 105 135 135
Polygon -7500403 true true 165 105 165 135 225 105 255 45 210 60
Polygon -7500403 true true 135 90 120 45 150 15 180 45 165 90

sheep
false
15
Circle -1 true true 203 65 88
Circle -1 true true 70 65 162
Circle -1 true true 150 105 120
Polygon -7500403 true false 218 120 240 165 255 165 278 120
Circle -7500403 true false 214 72 67
Rectangle -1 true true 164 223 179 298
Polygon -1 true true 45 285 30 285 30 240 15 195 45 210
Circle -1 true true 3 83 150
Rectangle -1 true true 65 221 80 296
Polygon -1 true true 195 285 210 285 210 240 240 210 195 210
Polygon -7500403 true false 276 85 285 105 302 99 294 83
Polygon -7500403 true false 219 85 210 105 193 99 201 83

square
false
0
Rectangle -7500403 true true 30 30 270 270

square 2
false
0
Rectangle -7500403 true true 30 30 270 270
Rectangle -16777216 true false 60 60 240 240

star
false
0
Polygon -7500403 true true 151 1 185 108 298 108 207 175 242 282 151 216 59 282 94 175 3 108 116 108

target
false
0
Circle -7500403 true true 0 0 300
Circle -16777216 true false 30 30 240
Circle -7500403 true true 60 60 180
Circle -16777216 true false 90 90 120
Circle -7500403 true true 120 120 60

tree
false
0
Circle -7500403 true true 118 3 94
Rectangle -6459832 true false 120 195 180 300
Circle -7500403 true true 65 21 108
Circle -7500403 true true 116 41 127
Circle -7500403 true true 45 90 120
Circle -7500403 true true 104 74 152

triangle
false
0
Polygon -7500403 true true 150 30 15 255 285 255

triangle 2
false
0
Polygon -7500403 true true 150 30 15 255 285 255
Polygon -16777216 true false 151 99 225 223 75 224

truck
false
0
Rectangle -7500403 true true 4 45 195 187
Polygon -7500403 true true 296 193 296 150 259 134 244 104 208 104 207 194
Rectangle -1 true false 195 60 195 105
Polygon -16777216 true false 238 112 252 141 219 141 218 112
Circle -16777216 true false 234 174 42
Rectangle -7500403 true true 181 185 214 194
Circle -16777216 true false 144 174 42
Circle -16777216 true false 24 174 42
Circle -7500403 false true 24 174 42
Circle -7500403 false true 144 174 42
Circle -7500403 false true 234 174 42

turtle
true
0
Polygon -10899396 true false 215 204 240 233 246 254 228 266 215 252 193 210
Polygon -10899396 true false 195 90 225 75 245 75 260 89 269 108 261 124 240 105 225 105 210 105
Polygon -10899396 true false 105 90 75 75 55 75 40 89 31 108 39 124 60 105 75 105 90 105
Polygon -10899396 true false 132 85 134 64 107 51 108 17 150 2 192 18 192 52 169 65 172 87
Polygon -10899396 true false 85 204 60 233 54 254 72 266 85 252 107 210
Polygon -7500403 true true 119 75 179 75 209 101 224 135 220 225 175 261 128 261 81 224 74 135 88 99

wheel
false
0
Circle -7500403 true true 3 3 294
Circle -16777216 true false 30 30 240
Line -7500403 true 150 285 150 15
Line -7500403 true 15 150 285 150
Circle -7500403 true true 120 120 60
Line -7500403 true 216 40 79 269
Line -7500403 true 40 84 269 221
Line -7500403 true 40 216 269 79
Line -7500403 true 84 40 221 269

wolf
false
0
Polygon -16777216 true false 253 133 245 131 245 133
Polygon -7500403 true true 2 194 13 197 30 191 38 193 38 205 20 226 20 257 27 265 38 266 40 260 31 253 31 230 60 206 68 198 75 209 66 228 65 243 82 261 84 268 100 267 103 261 77 239 79 231 100 207 98 196 119 201 143 202 160 195 166 210 172 213 173 238 167 251 160 248 154 265 169 264 178 247 186 240 198 260 200 271 217 271 219 262 207 258 195 230 192 198 210 184 227 164 242 144 259 145 284 151 277 141 293 140 299 134 297 127 273 119 270 105
Polygon -7500403 true true -1 195 14 180 36 166 40 153 53 140 82 131 134 133 159 126 188 115 227 108 236 102 238 98 268 86 269 92 281 87 269 103 269 113

x
false
0
Polygon -7500403 true true 270 75 225 30 30 225 75 270
Polygon -7500403 true true 30 75 75 30 270 225 225 270
@#$#@#$#@
NetLogo 6.4.0
@#$#@#$#@
@#$#@#$#@
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@#$#@#$#@
default
0.0
-0.2 0 0.0 1.0
0.0 1 1.0 0.0
0.2 0 0.0 1.0
link direction
true
0
Line -7500403 true 150 150 90 180
Line -7500403 true 150 150 210 180
@#$#@#$#@
0
@#$#@#$#@