Luc, framage
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In this modified road layout, the city has built a short 1 minute section of motorway connecting the two city street sections of route together. The shortest travel distance is now going straight down the midde, but since everyone chooses to take that route, the city street sections become slower and travel time *increases* from 35 minutes to 41 minutes. If a car chose to take one of the side routes it would take even longer (45 minutes) as they would end up on a clogged city street with everyone else.

(Do watch the video for a much clearer explanation.)

Screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A
In this modified road layout, the city has built a short 1 minute section of motorway connecting the two city street sections of route together. The shortest travel distance is now going straight down the midde, but since everyone chooses to take that route, the city street sections become slower and travel time *increases* from 35 minutes to 41 minutes. If a car chose to take one of the side routes it would take even longer (45 minutes) as they would end up on a clogged city street with everyone else. (Do watch the video for a much clearer explanation.) Screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A
A diagram showing two road routes from start to end. Each route contains two sections. One section is wide motorway where travel time is always 25 minutes and not related to the number of cars (within the volumes of this example). The other section is a narrow city street where travel time *is* proportional to the number of cars (one extra minute for each 100 cars).

In this example, if there are 2000 cars, and half take each route, then the journey time is 25 minutes + 10 minutes = 35 minutes.

This is a screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A
A diagram showing two road routes from start to end. Each route contains two sections. One section is wide motorway where travel time is always 25 minutes and not related to the number of cars (within the volumes of this example). The other section is a narrow city street where travel time *is* proportional to the number of cars (one extra minute for each 100 cars). In this example, if there are 2000 cars, and half take each route, then the journey time is 25 minutes + 10 minutes = 35 minutes. This is a screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A
In this modified road layout, the city has built a short 1 minute section of motorway connecting the two city street sections of route together. The shortest travel distance is now going straight down the midde, but since everyone chooses to take that route, the city street sections become slower and travel time *increases* from 35 minutes to 41 minutes. If a car chose to take one of the side routes it would take even longer (45 minutes) as they would end up on a clogged city street with everyone else.

(Do watch the video for a much clearer explanation.)

Screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A
In this modified road layout, the city has built a short 1 minute section of motorway connecting the two city street sections of route together. The shortest travel distance is now going straight down the midde, but since everyone chooses to take that route, the city street sections become slower and travel time *increases* from 35 minutes to 41 minutes. If a car chose to take one of the side routes it would take even longer (45 minutes) as they would end up on a clogged city street with everyone else. (Do watch the video for a much clearer explanation.) Screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A
A diagram showing two road routes from start to end. Each route contains two sections. One section is wide motorway where travel time is always 25 minutes and not related to the number of cars (within the volumes of this example). The other section is a narrow city street where travel time *is* proportional to the number of cars (one extra minute for each 100 cars).

In this example, if there are 2000 cars, and half take each route, then the journey time is 25 minutes + 10 minutes = 35 minutes.

This is a screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A
A diagram showing two road routes from start to end. Each route contains two sections. One section is wide motorway where travel time is always 25 minutes and not related to the number of cars (within the volumes of this example). The other section is a narrow city street where travel time *is* proportional to the number of cars (one extra minute for each 100 cars). In this example, if there are 2000 cars, and half take each route, then the journey time is 25 minutes + 10 minutes = 35 minutes. This is a screenshot from https://www.youtube.com/watch?v=-QTkPfq7w1A