Correction: Lee, J.; Kang, Y. A Dynamic Algorithm for Measuring Pedestrian Congestion and Safety in Urban Alleyways. ISPRS Int. J. Geo-Inf. 2024, 13, 434

We would like to address and correct errors found in the original publication of our article [1]. These corrections do not affect the main conclusions of the study, and we apologize for any inconvenience caused to readers and researchers.

1. Error in Equations

The mistake in Equation (3) lies in the length of the shoulder and the width of the chest thickness. We originally calculated the minimum pedestrian area (P) using a shoulder length of 0.417 m, a chest width of 0.233 m, and an additional 4 cm on each side (right, left, front, and back of both length and width). However, in the original publication, the values for the shoulder and chest were incorrectly stated. Additionally, the extra 4 cm was mistakenly calculated only once, which is a notation error.

The mistake in Equation (4) pertains to the length and width of the vehicle. We originally calculated the length of the vehicle as 4.7 m and the width as 1.7 m. However, the original publication incorrectly lists these values as 6.7 m and 3.7 m, respectively.

The corrected Equations (3) and (4) are presented below. The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.

$$\begin{gathered} P_{STA}={\int }_0^{T}D\left(t\right)dt \\ D\left(t\right)=P+B\left(ttc\right) \\ P=minimum pedestrian area=\left(4 \mathrm{c}\mathrm{m}+length+4 \mathrm{c}\mathrm{m}\right)\times \left(4 \mathrm{c}\mathrm{m}+width+4 \mathrm{c}\mathrm{m}\right) \\ B\left(ttc\right)=safety buffer={\displaystyle \frac{1}{TTC}}\times P \\ length=shoulder length=0.417 \mathrm{m} \\ width=chest thickness=0.233 \mathrm{m} \end{gathered}$$

(3)

$$\begin{gathered} V_{STA}={\int }_0^{T}D\left(t\right)dt \\ D\left(t\right)=V+B\left(ttc\right) \\ V=minimum vehicle area=\left(length+2 \mathrm{m}\right)\times \left(width+2 \mathrm{m}\right) \\ B\left(ttc\right)=safety buffer={\displaystyle \frac{1}{TTC}}\times V \\ length=vehicle length=4.7 \mathrm{m} \\ width=vehicle width=1.7 \mathrm{m} \end{gathered}$$

(4)

2. Text Correction

The mistake in the original publication lies in the incorrect values used for the average shoulder width and chest width. The original version stated the average shoulder width as 0.497 m and chest width as 0.313 m. However, the corrected version uses a median shoulder length of 0.417 m and a median chest width of 0.233 m.

A correction has been made to Section 3.2. Algorithm, Section 3.2.1. TTC and Safety Buffer, Paragraph 7:

The minimum required area for pedestrian (P) is calculated using a median shoulder length of 0.417 m and a median chest width of 0.233 m based on the anthropometric data of Koreans surveyed in 2021 [30]. An additional buffer of 4 cm is added to each side to account for lateral sway during walking [16,31]. For vehicles, the minimum required area (V) is determined using the standard dimensions of a passenger car in Korea, where the width and length are 1.7 m and 4.7 m, respectively, as specified by the Korean Ministry of Land, Infrastructure, and Transport. Additionally, a safety buffer of 2 m is added to both the width and length, resulting in final dimensions of 3.7 m and 6.7 m. The 2 m buffer corresponds to the minimum safe stopping distance typically maintained between a vehicle and a crosswalk on a road when the vehicle is stationary.