# Traffic Scheduler

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## Comments and Questions

breed [cars car] breed [trains train] breed [walkers walker] breed [traffic-lights traffic-light] ;; direction is one of 0, 90, 180, 270 cars-own [speed acceleration direction turning-left? turning-right? truck? emergency-vehicle? start-time] trains-own [speed direction] walkers-own [orig-speed speed direction student? start-time] patches-own [ intersection? sidewalk? crosswalk? track? sensor1? sensor2? sensor3? sensor4? from change-marker ] globals [ log-id gen-freq max-speed car-length truck-length road-color sidewalk-color lane-divider-color crosswalk-color track-underlay-color rail-color tie-color round-robin-state round-robin-last tick-count-last num-accidents-cars num-accidents-pedestrians max-wait-time-cars max-wait-time-pedestrians min-wait-time-cars min-wait-time-pedestrians total-wait-time-cars total-wait-time-pedestrians total-cars total-pedestrians ] to setup clear-all setup-globals setup-patches setup-agents setup-traffic-lights plot-data end to setup-globals set log-id 0 set gen-freq 10 set max-speed 2 set car-length 10 set truck-length 20 set road-color 3 ;; dark gray set lane-divider-color 46 ;; light yellow set sidewalk-color 8 ;; light gray set crosswalk-color 9.5 ;; off-white set track-underlay-color 38 ;; light-brown set rail-color 2 ;; steel gray set tie-color 33 ;; brown set round-robin-state 2 set round-robin-last "EW" set tick-count-last 0 set num-accidents-cars 0 set num-accidents-pedestrians 0 set max-wait-time-cars 0 set max-wait-time-pedestrians 0 set min-wait-time-cars 0 set min-wait-time-pedestrians 0 set total-wait-time-cars 0 set total-wait-time-pedestrians 0 set total-cars 0 set total-pedestrians 0 end to setup-patches ask patches [ set pcolor green set intersection? false set track? false set sensor1? false set sensor2? false set sensor3? false set sensor4? false set change-marker 0 ;; road if (pycor >= -10 and pycor <= 10) or (pxcor >= -10 and pxcor <= 10) [ set pcolor road-color ] ;; interesection if (pycor >= -10 and pycor <= 10) and (pxcor >= -10 and pxcor <= 10) [ set intersection? true set pcolor road-color ] ;; sidewalk if ((pxcor > 10 and pxcor <= 15) and (pycor < -10 or pycor > 10)) or ((pxcor < -10 and pxcor >= -15) and (pycor < -10 or pycor > 10)) or ((pycor > 10 and pycor <= 15) and (pxcor < -10 or pxcor > 10)) or ((pycor < -10 and pycor >= -15) and (pxcor < -10 or pxcor > 10)) [ set sidewalk? true set pcolor sidewalk-color ] ;; crosswalk if ((pxcor > 10 and pxcor <= 15) and (pycor >= -10 and pycor <= 10)) or ((pxcor < -10 and pxcor >= -15) and (pycor >= -10 and pycor <= 10)) or ((pycor > 10 and pycor <= 15) and (pxcor >= -10 and pxcor <= 10)) or ((pycor < -10 and pycor >= -15) and (pxcor >= -10 and pxcor <= 10)) [ set crosswalk? true ] ;; crosswalk lines if ((pxcor = 11 or pxcor = 15) and (pycor >= -10 and pycor <= 10)) or ((pxcor = -11 or pxcor = -15) and (pycor >= -10 and pycor <= 10)) or ((pycor = 11 or pycor = 15) and (pxcor >= -10 and pxcor <= 10)) or ((pycor = -11 or pycor = -15) and (pxcor >= -10 and pxcor <= 10)) [ set pcolor crosswalk-color ] ;; sensors if (pxcor < -15 and pxcor >= -20) and (pycor < 0 and pycor >= -10) [set sensor1? true set from 90 if show-sensors? [set pcolor 135]] ;;pink if (pxcor < 0 and pxcor >= -10) and (pycor > 15 and pycor <= 20) [set sensor1? true set from 180 if show-sensors? [set pcolor 135]] ;;pink if (pxcor > 15 and pxcor <= 20) and (pycor > 0 and pycor <= 10) [set sensor1? true set from 270 if show-sensors? [set pcolor 135]] ;;pink if (pxcor > 0 and pxcor <= 10) and (pycor < -15 and pycor >= -20) [set sensor1? true set from 0 if show-sensors? [set pcolor 135]] ;;pink if (pxcor < -10 and pxcor >= -15) and (pycor > 10 and pycor <= 15) [set sensor2? true set from 180 if show-sensors? [set pcolor 49]] ;; yellow if (pxcor < -10 and pxcor >= -15) and (pycor < -10 and pycor >= -15) [set sensor2? true set from 90 if show-sensors? [set pcolor 49]] ;; yellow if (pxcor > 10 and pxcor <= 15) and (pycor < -10 and pycor >= -15) [set sensor2? true set from 0 if show-sensors? [set pcolor 49]] ;; yellow if (pxcor > 10 and pxcor <= 15) and (pycor > 10 and pycor <= 15) [set sensor2? true set from 270 if show-sensors? [set pcolor 49]] ;; yellow if (pxcor < -55 and pxcor >= -60) and (pycor < 0 and pycor >= -10) [set sensor3? true set from 90 if show-sensors? [set pcolor 117]] ;;purple if (pxcor < 0 and pxcor >= -10) and (pycor > 55 and pycor <= 60) [set sensor3? true set from 180 if show-sensors? [set pcolor 117]] ;;purple if (pxcor > 55 and pxcor <= 60) and (pycor > 0 and pycor <= 10) [set sensor3? true set from 270 if show-sensors? [set pcolor 117]] ;;purple if (pxcor > 0 and pxcor <= 10) and (pycor < -55 and pycor >= -60) [set sensor3? true set from 0 if show-sensors? [set pcolor 117]] ;;purple if (pxcor > 0 and pxcor <= 15) and (pycor < 60 and pycor >= 55) [set sensor4? true if show-sensors? [set pcolor 68]] ;;green if (pxcor < 0 and pxcor >= -15) and (pycor > 70 and pycor <= 75) [set sensor4? true if show-sensors? [set pcolor 68]] ;;green ;; train tracks if (pycor > 60 and pycor <= 70) [ set track? true set pcolor track-underlay-color ] ;; train rails if (pycor >= 60 and pycor <= 61) or (pycor <= 70 and pycor >= 69) [ set pcolor rail-color ] ] ;; lane-dividers (do this for the entire patch set, not each patch) paint-stripes 15 0 1 0 max-pxcor 1 lane-divider-color 5 paint-stripes -15 0 -1 0 min-pxcor 1 lane-divider-color 5 paint-stripes 0 15 0 1 1 max-pycor lane-divider-color 5 paint-stripes 0 -15 0 -1 1 min-pycor lane-divider-color 5 ;; ties (do this for the entire patch set, not each patch) let index min-pxcor let width 2 let len 9 let step 5 while [index <= max-pxcor] [ let w 0 while [w < width] [ let l 0 while [l < len and (index + w <= max-pxcor)] [ ask patch (index + w) (61 + l) [set pcolor tie-color] set l (l + 1) ] set w (w + 1) ] set index (index + step) ] end to paint-stripes [x-start y-start x-incr y-incr x-max y-max col len] let on? true let patch-count 0 let x x-start let y y-start while [abs x <= abs x-max and abs y <= abs y-max] [ if patch-count mod len = 0 [set on? (not on?)] ask patch x y [ if on? [set pcolor col] ] set x (x + x-incr) set y (y + y-incr) set patch-count (patch-count + 1) ] end to setup-agents ;; cars set-default-shape cars "car" ;; walkers set-default-shape walkers "person" ;; train set-default-shape trains "train" end to setup-traffic-lights foreach [0 180] [set-car-light ? red] ;; "NS" foreach [90 270] [set-car-light ? green] ;; "EW" foreach [0 90 180 270] [set-walker-light ? red] ;; "ped" end to set-car-light [dir col] ask patches with [sensor1? = true and from = dir] [set pcolor col set change-marker ticks] end to set-walker-light [dir col] ask patches with [sensor2? = true and from = dir] [set pcolor col set change-marker ticks] end ;; runtime to go manage-traffic-light move-cars move-walkers move-trains gen-cars gen-walkers gen-trains tick plot-data end to manage-traffic-light if scheduling-algorithm = "round-robin" [manage-traffic-light-round-robin] ;;if scheduling-algorithm = "simple-priority" [manage-traffic-light-simple-priority] end to manage-traffic-light-round-robin ;; simple round robin if (round-robin-state = 2 and ticks - tick-count-last = green-light-duration) [ ;; change to orange if (round-robin-last = "NS") [ foreach [0 180] [set-car-light ? orange] ] if (round-robin-last = "EW") [ foreach [90 270] [set-car-light ? orange] ] if (round-robin-last = "ped") [ foreach [0 90 180 270] [set-walker-light ? orange] ] set round-robin-state 0 ;;type "(" type round-robin-state type ") " type "set tick-count-last " print ticks set tick-count-last ticks ] if (round-robin-state = 0 and ticks - tick-count-last = orange-light-duration) [ ;; change orange to red if (round-robin-last = "NS") [ foreach [0 180] [set-car-light ? red] ] if (round-robin-last = "EW") [ foreach [90 270] [set-car-light ? red] ] if (round-robin-last = "ped") [ foreach [0 90 180 270] [set-walker-light ? red] ] set round-robin-state 1 ;;type "(" type round-robin-state type ") " type "set tick-count-last " print ticks set tick-count-last ticks ] if (round-robin-state = 1 and ticks - tick-count-last = all-red-duration) [ let next-dir round-robin-last ;; new green lights if (round-robin-last = "NS") [ foreach [90 270] [set-car-light ? green] set next-dir "EW" ] if (round-robin-last = "EW") [ foreach [0 90 180 270] [set-walker-light ? green] set next-dir "ped" ] if (round-robin-last = "ped") [ foreach [0 180] [set-car-light ? green] set next-dir "NS" ] set round-robin-state 2 ;;type "(" type round-robin-state type ") " type "set tick-count-last " print ticks set tick-count-last ticks set round-robin-last next-dir ] end to gen-trains if (ticks mod gen-freq = 0) [ if ((random 100) < train-frequency) and (not any? trains) [ ask patch min-pxcor 65 [ sprout-trains 1 [init-train] ] ] ] end to init-train set heading 90 set size 20 set speed ((random 10) + 10) / 10 ;; visualize the train sensor ask patches with [sensor4? = true] [if show-sensors? [set pcolor red]] end to move-trains ask trains [ ifelse can-move? speed [ fd speed] [ ask patches with [sensor4? = true] [if show-sensors? [set pcolor 68]] die ] ] end to gen-walkers if (ticks mod gen-freq = 0) [ ;;show ticks foreach [0 90 180 270] [ let x 0 let y 0 let create? false if ? = 0 and (random 100) < S-pedestrian-density [ set x 13 set y min-pycor set create? true ] if ? = 90 and (random 100) < W-pedestrian-density [ set x min-pxcor set y -13 set create? true ] if ? = 180 and (random 100) < N-pedestrian-density [ set x -13 set y max-pycor set create? true ] if ? = 270 and (random 100) < E-pedestrian-density [ set x max-pxcor set y 13 set create? true ] if create? = true [ ask patch x y [ sprout-walkers 1 [ ;; pass in the current direction of the foreach loop init-walker ? ] ] ] ] ] end to init-walker [dir] if dir = 0 [set color violet] if dir = 90 [set color orange] if dir = 180 [set color 76] if dir = 270 [set color 96] set heading dir set direction dir set size 5 set speed ((random 5) + 5) / 30 set orig-speed speed set student? random 100 < 90 ; slider? if student? [set shape "person-student"] set start-time ticks end to move-walkers ask walkers [ ifelse can-move? speed [ ;; stop if at train sensor and train is passing let on-sensor4? false ask patch-here [if sensor4? [set on-sensor4? true] ] ifelse on-sensor4? and any? trains [ set speed 0 ] [ if speed = 0 [set speed orig-speed] ] ;; stop if at a traffic light and the color is red let on-sensor2? false let patch-from -1 ask patch-here [ if sensor2? [ set on-sensor2? true set patch-from from ] ] if on-sensor2? [ ifelse pcolor != green and direction = patch-from [ set speed 0 ] [ if speed = 0 [set speed orig-speed] ] ] fd speed ] [ let wait-time (ticks - start-time) if wait-time > max-wait-time-pedestrians [set max-wait-time-pedestrians wait-time] if (min-wait-time-pedestrians = 0) or (wait-time < min-wait-time-pedestrians) [set min-wait-time-pedestrians wait-time] set total-wait-time-pedestrians (total-wait-time-pedestrians + wait-time) set total-pedestrians (total-pedestrians + 1) die ] ] end to-report free-space [x y dir] ;;set log-id (log-id + 1) let dist 0 let max-dist (truck-length + 1) let x-delta 0 let y-delta 0 if dir = 0 [ set y-delta 1 ] if dir = 90 [ set x-delta 1 ] if dir = 180 [ set y-delta -1 ] if dir = 270 [ set x-delta -1 ] while [dist <= max-dist] [ let next-patch patch x y if next-patch != nobody [ let car-ahead one-of turtles-on next-patch if car-ahead != nobody and is-car? car-ahead [ ;;type log-id print "false" report false ] ] set x (x + x-delta) set y (y + y-delta) set dist (dist + 1) ] ;;type log-id print "true" report true end to gen-cars if (ticks mod gen-freq = 0) [ ;;show ticks foreach [0 90 180 270] [ let free-space? false; let x 0 let y 0 if ? = 0 and (random 100 < S-car-density) [ set x 5 set y min-pycor set free-space? (free-space x y ?) ] if ? = 90 and (random 100 < W-car-density) [ set x min-pxcor set y -5 set free-space? (free-space x y ?) ] if ? = 180 and (random 100 < N-car-density) [ set x -5 set y max-pycor set free-space? (free-space x y ?) ] if ? = 270 and (random 100 < E-car-density) [ set x max-pxcor set y 5 set free-space? (free-space x y ?) ] ;; TODO: decision here, or make it configurable? : only generate a car if there's room, ;; or let them stack up ;; if (x != 0) prevents the generation of cars when the randomization ;; above does not yield one :) if (x != 0) ;; and free-space? [ ask patch x y [ sprout-cars 1 [ ;; pass in the current direction of the foreach loop init-car ? ] ] ] ] ] end to init-car [dir] if dir = 0 [set color 37] ;; brown if dir = 90 [set color 47] ;; yellow if dir = 180 [set color 97] ;; blue if dir = 270 [set color 127] ;; magenta set heading dir set direction dir set turning-left? (random 100) < percent-turning-left set turning-right? (not turning-left?) and ((random 100) < percent-turning-right) set truck? random 100 < percent-trucks set emergency-vehicle? random 100 < percent-emergency-vehicles ifelse truck? [ set shape "truck-rotate" set size truck-length set speed ((random 5) + 5) / 10 set acceleration ((random-float .5) + .5) / 10 if dir = 270 [set shape "truck-rotate-inverted"] ] [ ifelse emergency-vehicle? [ set shape "ambulance" set size 15 set color red set speed ((random 10) + 10) / 10 set acceleration ((random-float 1.5) + .5) / 10 if dir = 270 [set shape "ambulance-inverted"] ] [ set size car-length set speed ((random 8) + 8) / 10 set acceleration ((random-float 1) + 1) / 10 if dir = 270 [set shape "car-inverted"] ] ] set start-time ticks end to check-ahead-and-react let current-speed speed ;;type current-speed type "__" ;; adjust if there's a car in front of you let found-car? false let dist 0 let max-dist (size / 2) + (truck-length / 2) + 1 while [dist <= max-dist and found-car? = false ] [ let next-patch patch-ahead dist if next-patch != nobody [ let car-ahead one-of turtles-on next-patch if car-ahead != nobody and is-car? car-ahead and car-ahead != self [ set found-car? true set speed (([speed] of car-ahead) - acceleration) ;; type dist type " [" type size type "] " type "[" type [size] of car-ahead type "]" ;; slow the car down even more if it is overlapping another car if dist < size or dist < [size] of car-ahead [set speed 0] ] ] set dist (dist + 1) ] ;; if no car, accelerate if found-car? = false [set speed speed + acceleration] if speed < 0 [set speed 0 ] if speed > max-speed [set speed max-speed] ;;type "__" print speed end to-report clear-on-other-side [max-dist] let found-car? false let dist 0 while [dist <= max-dist and found-car? = false ] [ let next-patch patch-ahead dist if next-patch != nobody [ let car-ahead one-of turtles-on next-patch if car-ahead != nobody and is-car? car-ahead and car-ahead != self [ set found-car? true ] ] set dist (dist + 1) ] report not found-car? end to move-cars ask cars [ ifelse can-move? speed [ check-ahead-and-react ;; stop if at train sensor and train is passing let on-sensor4? false ask patch-here [if sensor4? [set on-sensor4? true] ] if on-sensor4? [ ifelse any? trains or not clear-on-other-side (15 + size) [set speed 0] [if speed = 0 [ set speed .1]] ] ;; approaching intersection / traffic light let on-sensor1? false ask patch-here [if sensor1? [set on-sensor1? true]] if on-sensor1? [ ;; stop if at a traffic light and the color is red ;; stop at intersection if there is no room on the other side ;; TODO also handle turns (this will stop a car from turning even if there is room!) ifelse pcolor = red or (any? trains and not clear-on-other-side (20 + size)) [set speed 0] [if speed = 0 [set speed .1]] ] let in-intersection? false ask patch-here [if intersection? [set in-intersection? true]] if in-intersection? [ if turning-left? [ if direction = 0 [ ifelse ycor > 0 and ycor < 5 [set heading (heading - (15 * speed) / 2)] [if ycor >= 5 [set heading 270 ifelse truck? [set shape "truck-rotate-inverted"] [set shape "car-inverted"]]] ] if direction = 90 [ ifelse xcor > 0 and xcor < 5 [set heading (heading - (15 * speed) / 2)] [if xcor >= 5 [set heading 0]] ] if direction = 180 [ ifelse ycor < 0 and ycor > -5 [set heading (heading - (15 * speed) / 2)] [if ycor <= -5 [set heading 90]] ] if direction = 270 [ ifelse xcor < 0 and xcor > -5 [set heading (heading - (15 * speed) / 2)] [if xcor <= -5 [set heading 180 ifelse truck? [set shape "truck-rotate"] [set shape "car"]]] ] ] if turning-right? [ if direction = 0 [ ifelse ycor > -10 and ycor < -6 [set heading (heading + (15 * speed) / 2)] [if ycor >= -6 [set heading 90]] ] if direction = 90 [ ifelse xcor > -10 and xcor < -6 [set heading (heading + (15 * speed) / 2)] [if xcor >= -6 [set heading 180]] ] if direction = 180 [ ifelse ycor < 10 and ycor > 6 [set heading (heading + (15 * speed) / 2)] [if ycor <= 6 [set heading 270 ifelse truck? [set shape "truck-rotate-inverted"] [set shape "car-inverted"]]] ] if direction = 270 [ ifelse xcor < 10 and xcor > 6 [set heading (heading + (15 * speed) / 2)] [if xcor <= 6 [set heading 0 ifelse truck? [set shape "truck-rotate"] [set shape "car"]]] ] ] ] fd speed ] [ let wait-time (ticks - start-time) if wait-time > max-wait-time-cars [set max-wait-time-cars wait-time] if (min-wait-time-cars = 0) or (wait-time < min-wait-time-cars) [set min-wait-time-cars wait-time] set total-wait-time-cars (total-wait-time-cars + wait-time) set total-cars (total-cars + 1) die ] ] end to plot-data ;; write "m:" write count-make write " d:" print count-die set-current-plot "Car Wait Time" set-current-plot-pen "max-wait-time" plot max-wait-time-cars set-current-plot-pen "min-wait-time" plot min-wait-time-cars set-current-plot-pen "avg-wait-time" ifelse total-cars != 0 [plot total-wait-time-cars / total-cars] [plot 0] set-current-plot "Pedestrian Wait Time" set-current-plot-pen "max-wait-time" plot max-wait-time-pedestrians set-current-plot-pen "min-wait-time" plot min-wait-time-pedestrians set-current-plot-pen "avg-wait-time" ifelse total-pedestrians != 0 [plot total-wait-time-pedestrians / total-pedestrians] [plot 0] ; set-current-plot "Accidents" ; set-current-plot-pen "car-car" ; plot count d ; set-current-plot-pen "car-pedestrian" ; plot count e end

There is only one version of this model, created about 8 years ago by Coram Bryant.

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