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Reaction time - What is it?

The term "reaction time" is probably something you've heard about when you studied driving theory. Many people have trouble understanding the difference between reaction distance, braking distance and stopping distance and here we will go through what reaction distance is and how to calculate it. This information is something that may come up on the B licence theory test!

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1

What is meant by reaction time?

2

Calculate reaction time

3

Calculation of reaction distance

What is meant by reaction time?

The reaction time is the distance your car has to travel from the moment you detect a hazard until you press the brake pedal or swerve. The length of the reaction time is affected by:

  1. Car speed
  2. Driver reaction time

The reaction time increases proportionally with the speed of the car, which means that if you are travelling at 100 km/h, the reaction time is twice as long as if you are travelling at 50 km/h. Reaction time varies slightly from person to person but is normally 0.5-2 seconds. People aged 45-54 have the best reaction time.

Calculate reaction time

There are two different methods to calculate the reaction distance:

  • Easier and approximate method: reaction distance = speed (remove last digit) * reaction time * 3

So if you are driving at 50 km/h, the calculation of the reaction distance is:

5*1*3 = 15 meters

If you drive at 100 km/h, the reaction distance is 10*1*3 = 30 metres.

As we can see in the example, the reaction distance doubles when the speed doubles. As mentioned earlier, it increases proportionally with the speed of the car!

Calculation of reaction distance
  • More difficult and more accurate method: reaction distance (s)= (v*r)/3.6

v = speed km/h

r = reaction time (seconds)

If you drive at 50 km/h, the calculation of the reaction distance is as follows:

(50*1)/3,6 = 13.9 m.

As you can see, it is quite easy to calculate the reaction distance. If the question comes up on the theory test, it is not expected that you will be able to figure it out in your head using the exact method. You can use the approximate method to get an approximate result. The important thing is that you understand that the reaction time and your speed affect the reaction distance!

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    Traffic school Alvik

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    Driving licence for passenger car (automatic/manual)
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    Extended B96 & BE

    08-28 82 82

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    Körkort personbil (Automat och Manuell)

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    Johan Skyttesväg 187 C
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    Find out about all our training elements in more detail here.

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    the trainer has given the go-ahead.

    Course programme

    (Afternoon)

    DAY 1
    Monday: 10.40-12.40 + 13.40-16.40

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    UBK - training check. This training is only booked when the trainer
    the trainer has given the go-ahead.

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    ...never practised before but want to start your driving licence training in the best possible way!

    The three-week intensive course includes all of our training elements:

    (Find out about all our training sessions in more detail here)

    Intensive course 2 weeks

    ...are at the beginning of your driving training but have practiced before!

    The two-week intensive course includes the following training elements:

    (Find out about all our training sessions in more detail here)

    Intensive Course Schedule 3 weeks

    Subject to possible schedule changes.
    The practical training is divided into two students/car and teacher.

    V.1
    Homework: read the driving licence booklet and the study booklet, and solve the problems

    MONDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    TUESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    WEDNESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    THURSDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    FRIDAY
    8.40 - 11.20 driving lessons

    V.2
    MONDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    TUESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    WEDNESDAY
    7.45 - 12.30 Halkbana R2

    THURSDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch

    FRIDAY
    6.45 - 12.30 Road driving

    V.3
    MONDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch

    TUESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 16.40 driving lessons

    WEDNESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch

    THURSDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch

    FRIDAY
    Training control 1×80 min

    Intensive course schedule 2 weeks

    The following schedule shows the approximate course content and structure.
    Subject to possible schedule changes.
    The practical teaching is divided between two students/car and teacher.

    V.1
    Homework: read the driving licence booklet and the study booklet, and solve the problems

    MONDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    TUESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    WEDNESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    THURSDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    FRIDAY
    8.40 - 11.20 driving lessons

    V.2
    MONDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    TUESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    WEDNESDAY
    7.45 - 12.30 Halkbana R2

    THURSDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch

    FRIDAY
    6.45 - 12.30 Road driving

    Intensive course 1 week

    ...are at the end of their driving training and soon want to drive up and take the theory test!

    The one-week intensive course includes the following training elements:

    • Urban transport
    • Road
    • Motorway
    • Darkness driving
    • Stable road conditions
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    (Find out about all our training sessions in more detail here)

    Intensive Course Schedule 1 week

    The following schedule shows the approximate course content and structure.
    Subject to possible schedule changes.
    The practical teaching is divided between two students/car and teacher.

    V.1
    Homework: read the driving licence booklet and the study booklet, and solve the problems

    MONDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    TUESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    WEDNESDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    THURSDAY
    8.40 - 11.20 driving lessons
    11.20 - 14.00 Self-study/Lunch
    14.00 - 15.20 Choir lesson

    FRIDAY
    8.40 - 11.20 driving lessons