PTE · Describe Image

Traffic Light Systems and Operations: PTE Describe Image practice questions

4 original Describe Image questions. Question 1 is free to record, play back and compare with a sample answer right here; log in free to practise the rest in the BandLadder app.
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  • PTE Academic and PTE Core
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1

Traffic Signal Hardware Failures

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Look at the image below. You have 25 seconds to study it, then 40 seconds to describe in detail what it shows.

Reported Causes of Signal Outages (Incidents per Year). Urban Network: Power Disruption 120, Cable Faults 85, Controller Bugs 40, Vehicle Collision 65, Weather Damage 30. Rural Highways: Power Disruption 90, Cable Faults 35, Controller Bugs 15, Vehicle Collision 45, Weather Damage 75.

Reported Causes of Signal Outages (Incidents per Year)
04080120160200Power DisruptionCable FaultsController BugsVehicle CollisionWeather Damage
  • Urban Network
  • Rural Highways
View the data
Power DisruptionCable FaultsController BugsVehicle CollisionWeather Damage
Urban Network12085406530
Rural Highways9035154575

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Questions 2–4

Look at the image below. You have 25 seconds to study it, then 40 seconds to describe in detail what it shows.

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2

Emergency Vehicle Preemption Sequence

Emergency Vehicle Preemption Stages. Stage 1: Optical or Radio Sensor Detects Approaching Siren. Stage 2: Controller Aborts Active Green Phase Safely. Stage 3: Brief All-Red Clearance Interval Displayed. Stage 4: Dedicated Green Corridor Granted to Emergency Route. Stage 5: Normal Signal Cycle Resumes Following Departure.

Emergency Vehicle Preemption Stages
  1. 1.Optical or Radio Sensor Detects Approaching Siren
  2. 2.Controller Aborts Active Green Phase Safely
  3. 3.Brief All-Red Clearance Interval Displayed
  4. 4.Dedicated Green Corridor Granted to Emergency Route
  5. 5.Normal Signal Cycle Resumes Following Departure
3

Solar Powered Signal Installation Cost

Capital Expenditure for Off-Grid Signals (%). Photovoltaic Panels 25, Battery Storage Units 35, LED Signal Heads 15, Mounting Masts 10, Installation Labour 15.

Capital Expenditure for Off-Grid Signals (%)
  • Photovoltaic Panels: 25%
  • Battery Storage Units: 35%
  • LED Signal Heads: 15%
  • Mounting Masts: 10%
  • Installation Labour: 15%
View the data
CategoryValue (%)
Photovoltaic Panels25
Battery Storage Units35
LED Signal Heads15
Mounting Masts10
Installation Labour15
4

Traffic Signal Maintenance Comparison

Signal Lamp Technologies. Columns: Technology, Power Draw, Lifespan, Unit Replacement Cost. Incandescent, 150 W, 1,000 Hours, £15. Halogen, 75 W, 3,000 Hours, £25. Solid-State LED, 12 W, 60,000 Hours, £110.

Signal Lamp Technologies
TechnologyPower DrawLifespanUnit Replacement Cost
Incandescent150 W1,000 Hours£15
Halogen75 W3,000 Hours£25
Solid-State LED12 W60,000 Hours£110

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