1. 1 TRAFFIC INVESTIGATION LEVEL 1

2. 2 WHY INVESTIGATE?  TO FIND OUT WHAT HAPPENED  CRIMINAL OR CIVIL LITIGATION  SOMETIMES THERE ARE NO WITNESSES  EYE WITNESS TESTIMONY NOT ALWAYS RELIABLE (EXAMPLES)

3. 3 COLLISION IS A SERIES OF EVENTS

4. 4 ATTENDING THE COLLISION  1. SAFEGUARD THE SCENE  2. CARE FOR THE INJURED  3. LOCATE & QUESTION WITNESSES  4. PRESERVE & COLLECT EVIDENCE  5. INVESTIGATE COLLISION

5. 5 PHYSICAL EVIDENCE  MORE RELIABLE THAN WITNESS EVIDENCE  CAN HELP PROVE WHAT HAPPENED  SCENE DESTROYED BY WEATHER, PASSING MOTORISTS AND PEOPLE AT THE SCENE

6. 6 PHOTOGRAPH SCENE “PICTURE WORTH A THOUSAND WORDS” TAKE PHOTOS OF EVERYTHING: VEHICLES ROADWAY LIGHTS SKID MARKS OBSTRUCTIONS

7. 7 PHOTOGRAPH SCENE TAKE PHOTOS OF EVERYTHING: DRIVERS & WITNESSES VIEWPOINTS PHOTOS FROM ALL DIRECTIONS SIGNS VIDEO OF SCENE OVERHEAD PHOTOS GAUGES

8. 8 ENVIRONMENT  TIME OF DAY  CLEAR OR CLOUDY SKIES  TEMPERATURE  PRECIPITATION  LIGHTING CONDITIONS: SUN’S POSITION, STREET LIGHTS

9. 9 ROADWAY DESCRIPTION  ROAD SURFACE: PAVED, GRAVEL  SURFACE CONDITION: WET, DRY, ICY, SNOW, POTHOLES  ROADWAY: ELEVATED,CURVED, BANKED,  ROAD MARKINGS  TRAFFIC CONTROL DEVICES, SIGNS  OBSTRUCTIONS: TREES, FENCES

10. 10 SURFACE MARKS  SKID MARKS: LENGTH, FROM WHAT VEHICLE, DIRECTION  ACCELERATION MARKS  SCRAPE MARKS & GOUGES: WHAT CAUSED THEM

11. 11 FINAL REST POSITIONS  NUMBER OF VEHICLES AND WHERE THEY WERE IN RELATION TO EACH OTHER  WHERE WERE OCCUPANTS SEATED - WERE THEY EJECTED?

12. 12 FLUIDS AND DEBRIS  VEHICLE PARTS AND THEIR POSITION AND CONDITION  OBJECTS THROWN FROM INSIDE VEHICLE  TYPE OF FLUID  PATTERN OF FLUID: CIRCULAR PUDDLE OF LONG NARROW STRIP

13. 13 VEHICLE EXAMINATION  MAKE AND MODEL OF VEHICLE  CONDITION PRIOR TO COLLISION  BRAKES: ANTILOCK, CONDITION  TRANSMISSION: TYPE, GEAR POSITION  WINDSHIELD: TINTED, CRACKS, FROSTED OVER  LIGHTS: ON, OFF, FUNCTIONING  WEIGHT OF VEHICLE

14. 14 TIRE EXAMINATION  MAKE AND MODEL OF TIRES  WERE ALL TIRES SAME MAKE?  TIRE CONDITION: NEW, WORN  TREADS: EVEN WEAR, DEPTH  STUDDED TIRES  PROPERLY INFLATED  LUGS PROPERLY ON

15. 15 LIGHTS  LIGHT TYPES: DAYTIME RUNNING, SIGNAL, BRAKE, HIGH BEAM, EMERGENCY FLASHERS, FOG  WERE LIGHTS ON OR OFF?  WERE LIGHTS WORKING BEFORE OR AFTER COLLISION?

16. 16 CONTROL INSTRUMENTS  POSITION OF THE SWITCHES? –WIPER CONTROLS –HEADLIGHTS –CRUISE CONTROL –WINDOW DEFROSTER –CELLULAR PHONE: ON OR OFF - WHAT GEAR WAS VEHICLE IN?

17. 17 INTERIOR CONTACT DAMAGE  WHAT PART OF THE BODY HIT WHAT PART OF THE VEHICLE?  WERE THERE LOOSE OBJECTS IN VEHICLE THAT HIT SOMETHING?  WHAT WAS POSITION OF OCUPANTS?  WERE SEATBELTS WORN?

18. 18 EXTERIOR CONTACT DAMAGE WHAT DID VEHICLE COLLIDE WITH? VEHICLETREE POLEBUILDING PERSONFENCE DIRECTION OF IMPACT: RIGHT ANGLEHEAD ON SIDESWIPEBEHIND

19. 19 WITNESS EVIDENCE EVIDENCE AT SCENE WILL EITHER SUPPORT OR REFUTE WITNESS STATEMENT VIEW COLLISION FROM DRIVER AND/OR WITNESSES VIEWPOINT DRIVER AND OCCUPANT’S STATEMENTS MAY BE BIASSED

20. 20 CHECK ON DRIVER’S CONDITIONS  DRUGS OR ALCOHOL A PROBLEM  MEDICAL PROBLEM  EYESIGHT  MENTAL STATE  MEDICAL EXAMINERS REPORT  24 HOUR BACKGROUND CHECK

21. 21 COLLISION 1-2  NORTHBOUND DEERFOOT TRAIL OFFRAMP TO EASTBOUND GLENMORE TRAIL  TIRE MARKS GO ONTO RIGHT RIGHT SHOULDER ..

22. 22 COLLISION 1-3  TIRE MARKS ONTO GRASS ON RIGHT AND THEN BACK ONTO ROADWAY

23. 23 COLLISION 1-4  TRIE MARKS ONTO RIGHT SHOULDER, GRASS

24. 24 COLLISION 1-5  TIRE MARKS ONTO CONCRETE RETAINING WALL THAT SUPPORTS BRIDGE  WHAT MIGHT TIRE MARKS PRIOR TO COLLISION MEAN?

25. 25 COLLISION 1-6  VEHICLE COMES DOWN RETAINING WALL ONTO ROADWAY, FLIPS ONTO SIDE AND SLIDES DOWN ROADWAY

26. 26 COLLISION 1-7  VEHICLE AT REST ON ROADWAY  ITEMS THROWN FROM VEHICLE  WHAT IS ITEM ON GRASS?

27. 27 COLLISION 1-8 COAT WITH MICKEY BOTTLE THROWN FROM VEHICLE  WHAT MIGHT COAT AND ALCOHOL BOTTLE INDICATE?

28. 28 COLLISION 1-9 OCCUPANT THROWN ONTO ROAD IN FRONT OF VEHICLE  WHAT MIGHT THE POSITION OF THE VICTIM THROWN FROM THE VEHICLE INDICATE?

29. 29 COLLISION 1  WHAT DO YOU THINK HAPPENED?  WHAT PHYSICAL EVIDENCE SUPPORTS YOUR VERSION OF WHAT OCCURRED?

30. 30 COLLISION 1- SUMMARY  VEHICLE VEERED OFF ROADWAY, AND TRIED TO CORRECT IT’S PATH BUT LOST CONTROL AND FLIPPED OVER  SPEED WAS A FACTOR: 100KM/HR IN A SUGGESTED 50KM/HR ZONE  ALCOHOL WAS A FACTOR  5 OCCUPANTS IN CAR: 4 WORE SEATBELTS AND SURVIVED  PASSENGER IN REAR DRIVER SEAT DID NOT WEAR SETBELT AND WAS THROWN OUT AND KILLED

31. 31 COLLISION 2-2  OVERHEAD PHOTO SHOWING ROADWAY WHERE COLLISION OCCURRED

32. 32 COLLISION 2-3  OVERHEAD PHOTO SHOWING TIRE MARKINGS

33. 33 COLLISION 2-4  GLASS ON ROAD SHOWS POINT OF IMPACT

34. 34 COLLISION 2-5  TRUCK COMES TO REST

35. 35  CAR COMES TO REST COLLISION 2-6

36. 36 COLLISION 2-7  FRONT END OF TRUCK AT REST

37. 37 COLLISION 2-8  DAMAGE TO CAR

38. 38 COLLISION 2-9  GAUGES ON TRUCK

39. 39 COLLISION 2-10 SHOWS GEAR OF CAR

40. 40 COLLISION 2-11  SHOWS KEY POSITION OF CAR

41. 41 COLLISION 2  WHAT DO YOU THINK HAPPENED?  WHAT PHYSICAL EVIDENCE SUPPORTS YOUR VERSION OF WHAT OCCURRED?

42. 42 COLLISION 2: SUMMARY  CAR WAS PARKED ON SIDE OF ROADWAY FOR 15 MINUTES BEFORE BEING HIT  3 OCCUPANTS IN CAR, ONE WAS KILLED AND OTHERS SUSTAINED NONE LIFE THREATENING INJURIES  TRUCK MADE LEFT TURN, HIT PARKED CAR AND DROVE IT INTO A BUILDING  WITNESSES STATE TRUCK DRIVER WAS DRIVING WRECKLESSLY BEFORE THIS COLLISION  TRUCK WAS IN GOOD SHAPE AND FULLY LOADED – 62, 500 KG.

43. 43 SAFETY FEATURES  SEATBELTS/CHILD RESTRAINTS  AIR BAGS  IMPACT ZONES  ANTI LOCK BRAKES  HELMETS  MOTORCYCLE LEATHERS

44. 44 STOPPING DISTANCES 3 FACTORS DETERMINE STOPPING DISTANCE: PERCEPTION TIME: ¾ OF A SECOND REACTION TIME:¾ OF A SECOND BRAKING TIME:TIME TAKEN TO STOP VEHICLE

45. 45 STOPPING DISTANCES UNDER NORMAL ROAD CONDITIONS