GB/T 26773-2011Intelligent transport systems -- Lane departure warning systems -- Performance requirements and test procedures (English PDF)

3.1 Lane

The driving zone without any fixed obstacles where the driver does not need to

change the driving path.

3.2 Visible lane marking

Markings placed on the lane boundary which can be directly seen by the driver

during driving (e.g. not covered by snow, etc.).

3.3 Incidental visible road feature

A visible road feature on the road surface which is not used to accurately

describe the lane boundary line, but to indicate the lane position.

3.4 Lane boundary

A lane boundary line determined by visible lane markings; or determined by

other incidental visible road features or by other means such as GPS, magnetic

markers, etc. in the absence of visible lane markings. See Figure 1 and Figure

2.

3.5 Default lane width

The width which is preset for the lane when there is a visible lane marking on

only one side of the lane and the system does not detect other lane boundaries.

3.6 Departure

The condition in which the outer edge of one of the front wheels of the vehicle

or the tractor of articulated vehicle is crossing the designated marking.

4.1 System functions

The functional composition of lane departure warning systems is illustrated in

Figure 3.Where suppression request, vehicle speed measurement, driver

4.2 System classification

The classification of lane departure warning systems is shown in Table 1.The

system shall warn at least under one of the curve curvature conditions.

4.3 System requirements

4.3.1 Basic requirements

The lane departure warning systems shall have at least the following functions.

4.3.2 Operational requirements

4.3.2.1 When meeting the warning condition, the system shall automatically

send a warning to alert the driver.

4.3.2.2 The latest warning line of passenger car is located at 0.3 m outside the

lane boundary. The latest warning line of commercial vehicle is located at 1 m

outside the lane boundary.

4.3.3 Human-machine interaction requirements

4.3.3.1 Warning form

The system shall provide a haptic and (or) audible warning which is easily

perceived.

4.3.3.2 Conflict with other warnings

If the vehicle is equipped with other warning systems such as the vehicle front

collision warning system (FVCWS), the lane departure warning system (LDWS)

shall, by haptics, hearing, or vision, or a combination, provide the driver with a

clearly identifiable warning.

4.3.4 Optional functions

4.3.4.1 The system may be equipped with an on/off device for the driver to

operate at any time.

Rate of departure Maximum distance within the lane boundary

The TTLC is multiplied by the rate of departure. See 3.9.

4.3.4.2 The system may detect the suppression request signal, to minimize

unnecessary warnings. For example, when the driver is performing steering,

braking, or other higher-priority operations such as collision avoidance

operation, the system suppression request is in effect.

4.3.4.3 When the warning is suppressed, the system may notify the driver.

4.3.4.9 The system may suppress additional warnings, to avoid annoying the

driver due to excessive warning information.

5.1 Test environmental conditions

It shall use the following test environmental conditions.

5.2 Test lane conditions

The radius of curvature of the test lane shall be within ±10% of the minimum

radius of curvature of the corresponding type in Table 1.The test lane shall be

of sufficient length, to meet the needs of the minimum operating speed (i.e.

Type I 17 m/s, Type II 20 m/s), so that the vehicle can, at a rate of departure of

5.3 Test vehicle conditions

The mass of the test vehicle shall be BETWEEN the total of complete vehicle

kerb mass plus the mass of driver and test equipment (The total mass of the

driver and test equipment does not exceed 150 kg) AND the maximum

allowable total mass.

5.4 Installation and setup of test system

Installation and setup of lane departure warning systems shall be performed in

accordance with the equipment instructions provided by the manufacturer. For

the test of lane departure warning systems with user-adjustable warning

threshold, it shall perform each test twice; that is, the warning threshold is set

at the earliest warning line once and set at the latest warning line once. After

the start of the test, it is not allowed to change the system setup.

5.5 Test procedures

5.5.2 Procedures

5.5.2.1 It shall complete the following three tests.

5.5.2.2 Warning generation test

At the beginning of the test, the vehicle shall be basically in the center of the

lane.

5.5.2.3 Repeatability test

The repeatability test shall be performed on a straight road section. The driving

speed of vehicle is selected according to the system classification in Table 1.

For Type I systems, it shall select 20 m/s~22 m/s.

5.6 Standards for passing tests

5.6.1 Warning generation test

In each test, the system shall ensure that the vehicle issues a warning before it

has crossed the latest warning line after crossing the earliest warning line.

5.6.2 Repeatability test

For each test group, the system's warning threshold shall always be in a fixed

zone of 0.3 m wide.

5.6.3 False alarm test

When the vehicle is located between the left and right earliest warning lines (i.e.

no warning zone), the system shall not issue a warning.

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