Exame de Código (Driving Theory Test) - Portugal · Driving Safety, Hazards, and Vehicle Operation

Active Safety, Braking Dynamics, Weather Hazards, and Human Factors

100 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 100 questions

  1. In road safety physics, what components make up the total stopping distance of a moving vehicle?
  2. In driver psychology, what is the average reaction time of a healthy alert driver in an unexpected emergency?
  3. In vehicle dynamics, if a vehicle doubles its speed from 50 km/h to 100 km/h, by what factor does braking distance increase?
  4. In road safety, how does traveling speed affect the distance covered during a driver's reaction time?
  5. In defensive driving, what is the recommended minimum following safety distance on dry roads in good weather?
  6. In adverse weather conditions, how should a driver adjust following safety distance when traveling on wet asphalt in rain?
  7. In road safety, how does human fatigue affect a driver's reaction time and visual perception?
  8. In long-distance road trips, what is the recommended driving duration before taking a mandatory rest break to combat fatigue?
  9. In vehicle braking, what causes brake fade (fadiga dos travões) during long mountain descents?
  10. In road safety, how does a driver prevent brake fade when descending long steep mountain passes?
  11. In human physiology, how does the body eliminate consumed alcohol from the bloodstream?
  12. In Portuguese traffic law, what sanctions apply to a standard driver detected with a blood alcohol level of 0.65 g/l?
  13. In Portuguese traffic law, what sanctions apply when a driver is detected with a blood alcohol level of 0.95 g/l?
  14. In Portuguese traffic law, what blood alcohol concentration constitutes a criminal offense (crime rodoviário)?
  15. In driver psychology, how does alcohol consumption affect risk assessment and hazard perception?
  16. In road safety, what danger is posed by driving while taking medications marked with a red warning triangle?
  17. In road safety, what effect does the consumption of cannabis / marijuana have on driving ability?
  18. In driver wellness, what is the only effective remedy for acute driver sleepiness (sonolência ao volante)?
  19. In road safety, why is asphalt road surface most slippery during the initial minutes of rain (primeiras chuvas)?
  20. In vehicle dynamics, what physical event defines the onset of aquaplaning (hidroplanagem)?
  21. In emergency vehicle handling, how should a driver react if aquaplaning occurs?
  22. In road safety, what primary tire factor increases the risk of aquaplaning at lower speeds?
  23. In adverse weather conditions, why is using high-beam headlights (máximos) dangerous in dense fog?
  24. In winter driving, where is transparent black ice most likely to form first?
  25. In road safety, what warning sign on the instrument cluster indicates that the exterior temperature is approaching freezing?
  26. In vehicle dynamics, how should a driver steer when their vehicle experiences rear-wheel oversteer (traseira a fugir)?
  27. In active vehicle safety, what is the operational purpose of an Anti-lock Braking System (ABS)?
  28. In chassis safety, what is the role of an Electronic Stability Programme (ESP)?
  29. In vehicle maintenance, what is the minimum legal tire tread depth for passenger cars in Portugal?
  30. In tire safety, how does operating a vehicle with underinflated tires affect vehicle dynamics?
  31. In road safety, why must tire pressure be measured when tires are cold?
  32. In passive vehicle safety, what is the primary function of the head restraint on a car seat?
  33. In passive vehicle safety, why is an airbag alone insufficient to protect a vehicle occupant without a seatbelt?
  34. In passive safety, why must the front passenger airbag be deactivated when installing a rear-facing infant car seat?
  35. In vehicle dynamics, what primary safety advantage does the Anti-lock Braking System (ABS) provide during emergency braking?
  36. In modern vehicle safety systems, how does Electronic Stability Control (ESC or ESP) prevent vehicle skidding?
  37. Under Portuguese road regulations, what is the statutory minimum tyre tread depth for passenger cars (Category B)?
  38. In automotive maintenance, when should tyre inflation pressures be checked for accurate readings?
  39. In vehicle safety, what hazard is directly caused by driving on under-inflated tyres?
  40. In tyre maintenance, what is the primary negative consequence of substantially over-inflating tyres?
  41. In road safety physics, what phenomenon causes aquaplaning (hidroplanagem) on wet asphalt?
  42. In defensive driving, what should a driver do immediately if the vehicle begins to aquaplane?
  43. In vehicle mechanics, what causes brake fade (fadiga dos travões) during prolonged downhill driving?
  44. In vehicle operation, how can a driver effectively use engine braking (travão de motor) on steep descents?
  45. Under Portuguese vehicle technical standards, dipped-beam headlights (médios) must illuminate the roadway for at least what distance?
  46. Under Portuguese technical regulations, main high-beam headlights (máximos) must illuminate the roadway for at least what distance?
  47. In Portuguese traffic law, when is a driver strictly forbidden from using rear fog lights (luzes de nevoeiro à retaguarda)?
  48. If the red oil pressure warning light illuminates on the dashboard while driving, what action is required?
  49. In vehicle mechanics, what should a driver never do when the engine coolant temperature reaches the red danger zone?
  50. In automotive engineering, what is the primary role of a three-way catalytic converter in the exhaust system?
  51. In diesel passenger vehicles, what driving condition facilitates Diesel Particulate Filter (DPF) regeneration?
  52. In vehicle ergonomics, how should a three-point safety seat belt be positioned across the driver body?
  53. In passive vehicle safety, what is the correct height adjustment for a front seat head restraint?
  54. Under Portuguese road law, what must be done before placing a rear-facing child restraint on the front passenger seat?
  55. In Portuguese traffic regulations, children under what age and height must use an approved child restraint system (SRC)?
  56. Under Portuguese road law, what type of mobile phone communication is legally permissible while operating a motor vehicle?
  57. In Portugal, how many penalty points are deducted from a driving licence for driving while using a handheld mobile phone?
  58. Under Portuguese traffic law, how long is the probationary period (regime probatório) for a newly licensed Category B driver?
  59. In Portugal, what is the statutory blood alcohol concentration (BAC) limit for novice drivers during their probationary period?
  60. In Portugal, what is the statutory blood alcohol concentration limit for standard experienced non-professional drivers?
  61. Under Portuguese criminal law, at what blood alcohol concentration does driving constitute a criminal offense punishable by imprisonment?
  62. Under the Portuguese points-based driving licence system (Carta por Pontos), how many initial points does a driver receive?
  63. In the Portuguese Carta por Pontos system, how many points are typically deducted for committing a grave infraction (contraordenação grave)?
  64. In the Portuguese Carta por Pontos system, how many points are deducted for committing a very grave infraction (contraordenação muito grave)?
  65. Under the Carta por Pontos system, what mandatory sanction occurs when a driver point balance drops to 4 or 5 points?
  66. Under the Carta por Pontos system, what legal requirement applies when a driver point balance reaches 1 to 3 points?
  67. In Portugal, what is the consequence when a driver loses all remaining points on their Carta por Pontos?
  68. Under the Carta por Pontos system, how can a Portuguese driver gain additional bonus points on their licence?
  69. In Portuguese traffic law, at what minimum distance behind a disabled vehicle must the hazard warning triangle be placed?
  70. Under Portuguese road regulations, when must a driver wear the mandatory reflective safety vest (colete retrorrefletor)?
  71. Under Portuguese vehicle regulations, which emergency equipment is legally mandatory inside a private passenger car?
  72. In Portugal, what is the mandatory periodic technical inspection (IPO) schedule for a new light passenger car?
  73. Which legal documents must a driver present upon request to Portuguese traffic authorities (GNR or PSP)?
  74. In Portuguese traffic law, what minimum level of motor vehicle insurance coverage is legally compulsory?
  75. In Portugal, what legal action is taken when a motor vehicle is found circulating on a public road without compulsory insurance?
  76. In defensive driving, how should a driver adjust their following distance behind another vehicle when roads are wet?
  77. In defensive driving methodology, how far ahead along the roadway should an alert driver continually scan?
  78. In vehicle operation, why is glancing over the shoulder necessary before changing traffic lanes?
  79. When traffic comes to a complete standstill inside a road tunnel, what safety spacing should be maintained?
  80. If a vehicle catches fire inside a road tunnel and cannot be driven out, what must the driver do?
  81. Under Portuguese road regulations, what minimum lateral clearance must drivers maintain when passing a cyclist?
  82. In Portuguese traffic regulations, when is a driver permitted to overtake another vehicle on the right?
  83. In Portuguese traffic law, where is reversing (marcha atrás) strictly prohibited at all times?
  84. In Portugal, what is the legal rule regarding towing a disabled private passenger car with a flexible rope on a motorway?
  85. In eco-driving principles, at what engine speed (RPM) is it generally recommended to shift up gears in modern petrol cars?
  86. In vehicle fuel efficiency, what is the impact of driving with an unloaded roof rack or roof box at highway speeds?
  87. In modern fuel-injected vehicles, how does coasting in gear without pressing the accelerator affect fuel consumption?
  88. In driver psychology, what early warning sign indicates dangerous driver fatigue?
  89. In road safety, what is the only truly effective short-term countermeasure for severe driver drowsiness?
  90. In roadside emergency assistance, what sequence of actions does the internationally recognized PAS acronym stand for?
  91. In first aid at traffic collisions, under what condition should an injured motorcyclist crash helmet be removed by bystanders?
  92. In first aid, what is the proper emergency care for an accident victim displaying signs of severe traumatic shock?
  93. In adverse weather conditions, how should a driver adjust vehicle speed when encountering sudden dense fog?
  94. In vehicle dynamics, what physical sensation gives the driver immediate warning that aquaplaning is occurring?
  95. When a vehicle experiences oversteer (the rear wheels slide outward in a turn), how should the driver counter-steer?
  96. If the red battery charging indicator lamp illuminates while driving, what mechanical problem is indicated?
  97. In automotive maintenance, why must hydraulic brake fluid be periodically replaced every two years?
  98. In modern Advanced Driver Assistance Systems (ADAS), what is the function of the Blind Spot Detection (BSD) system?
  99. In automotive safety technology, how does a Lane Departure Warning (LDW) system alert the driver?
  100. In modern vehicle safety standards, what is the role of Autonomous Emergency Braking (AEB)?

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