ITE Journal - May 2021 - 25

Figure 3 presents the range of color space coordinates for the three colors mentioned above. When
demarcating the lane, the chromaticity should be in
this range, as shown in the manual. Once installed, the
colors should keep a certain level of retroreflectivity, just
like regular lane markings.
Range of color space
Cord.

1

2

3

4

X

0.415

0.435

0.465

0.485

Y

0.270

0.245

0.315

0.290

Light
green

X

0.360

0.340

0.375

0.410

Y

0.635

0.590

0.550

0.585

Natural
green

X

0.250

0.265

0.020

na

Y

0.740

0.620

0.770

na

Pink

Right after the development of the manual in 2017,
the KEC decided to extend the system to all expressways in Korea at all junctions, and some interchanges
that could cause confusion while changing direction on
the expressway. Seoul's metropolitan government had
adopted the system, through three pilot projects in 2016
and 20 additional ones in 2017. In 2018, it increased
the number of projects to 48 in the Seoul metropolitan
area.3 The system's impact was reported numerously-a
31 percent decrease in expressway crashes.4 In Seoul,
lane changing at crossroads had decreased by 21 percent
after the three pilot projects in 2016, and by 50 percent
after the 20 additional projects the following year, showing favorable traffic safety improvement conditions.3

source: MOLIT, 2017

Color

Figure 3: Range of Color Space Coordinates

A crucial lesson that can be learned from the system
concerns the role of policymakers. They should examine
an innovative idea with an open mind for the opportunity to save even a single life on the road. As such,
the author hopes that the system is replicated in many
countries to enhance traffic safety. Furthermore, the
system could be helpful to be served to guide automated
vehicles with the color in the future. itej

References

A color guidance lane is shown near an exit of expressways.

1.	 Korea Expressway Corporation. http://www.ex.co.
kr/eng/. (Accessed April 8, 2021)
2.	 Color Guidance Lane Installation and Maintenance Manual. MOLIT, Korea, 2017.
3.	 Korea JoongAng Daily. " Pink Color Guidance
Lane Will Be Expanded Three Times. " https://
news.joins.com/article/22871240 (Accessed April
8, 2021).
4.	 KuktoMaeil. " KEC, all junctions have color guidance lane - easy to navigate on freeways. " www.
pmnews.co.kr/newnews/print.php?uid=19243
(Accessed April 8, 2021).
w w w .i t e.or g

May 2021

25


http://www.ex.co.kr/eng/ http://www.ex.co.kr/eng/ https://news.joins.com/article/22871240 https://news.joins.com/article/22871240 http://pmnews.co.kr/newnews/print.php?uid=19243 http://pmnews.co.kr/newnews/print.php?uid=19243 http://www.ite.org

ITE Journal - May 2021

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