Post Number: 3
|Posted on Tuesday, May 27, 2014 - 02:35 pm: |
Easy question for you: If you look along 423, the left turn lanes have a diagonally angled curb as you enter the left turn lane. But if you turn off 423 onto a Frisco city street, the left turn lanes often have a 90-degree curb with a painted diagonal angled lane. I've always wondered why Frisco is unique that way. Is it a cost savings? New safety thinking?
Joel Fitts, Senior Traffic Engineer
Post Number: 154
|Posted on Monday, June 16, 2014 - 11:15 am: |
Most of our major thoroughfares are planned to be six-lane roadways in the future, but are built initially as four-lane roadways to save money until we really need the additional lanes (once traffic has increased to that point). We build the four-lane roadways with a wide median so the future 5th and 6th lanes can be added on the inside of the road (rather than adding them on the outside of the road and disrupting all of the driveways and sidewalks, etc.).
When a left-turn lane is built along one of these four-lane roadways that will be widened to six in the future, that left-turn lane is in the location of where the future through lane will be. Therefore, the left-turn lane is built in a way that it will be easy to connect to the end of it when it is converted to a through lane (eliminating the need to remove and repave the area with an angled curb). This saves time, materials, and money in the future when the road is widened.
Senior Traffic Engineer