It is common for people to use the terms roundabout and traffic circle interchangeably, as though there is no difference between the two. Sadly, Streetsblog San Francisco, whose mission is to educate the public, claims that there is no significant difference and that it is OK to use the terms interchangeably (SFMTA Launches “Muni Backwards” […]
Out riding yesterday on 2nd Avenue in Sacramento, I ran across this sign, on the south side between 22nd and 23rd streets. It pretty much says it all, though I have to add – “drive like you want your kids to have a future,” which pretty much means, don’t drive at all. The link is http://drivelikeyourkidslivehere.com, and you […]
I walk a lot in midtown, going to and from various destinations such as the train station, nonprofits and agencies I work with, grocery stores, theatres, farmers markets, breweries, etc. I was thinking last night as I walked to and from Capital Stage about what streets I choose to walk on.
Almost all the time I choose to walk on two-way, two-lane streets. I rarely choose to walk on the multi-lane streets and the one-way streets, except for short distances as I zigzag to my destination. The two-way, two-lane streets are usually quieter, less traffic and traffic moving more slowly. I can relax more with the quiet, and I can look around more, paying more attention to everything around me and not just traffic.
Why is this significant?
Protected bikeways, also called separated bike lanes or cycle tracks, are all the rage these days. The NACTO Urban Bikeway Design Guide codified cycle tracks, but they were already showing up in several cities, and are now being implementing in a great number more. I’ve ridden on cycle tracks in Long Beach, San Francisco (just yesterday, in fact) and other cities, and yes, they are a pleasure to ride on compared to riding in traffic or traditional bike lanes. Many people have declared the era of vehicular cycling dead, and the era of protected bikeways upon us.
So why am I doubting?
In the month of May I bike commuted to work in Carmichael and Citrus Heights most of the days. I had plenty of time to think about stop signs, as there are a lot of them on my regular routes. A few less, now that the county has removed some from the parkway path, but still, a lot. At most of these stop signs, there are no cars anywhere in sight, particularly at the beginning of AM and PM commute hours when I’m riding, but even at other times of day. So I started thinking, why are these stop signs here, and what are stop signs for?
Stop signs get used for these purposes:
- When there is a busy intersection with a more or less equal flow of vehicles on both streets. The four-way stop signs assist people in taking turns.
- When one street is so busy that gaps long enough to cross that street are rare.
- When there are visibility issues that prevent vehicle drivers to see each other.
- When motor vehicles are going too fast, and they need to be slowed down.
Looking at each purpose in more detail:
I have noticed a lot of confusion in Sacramento amongst both transportation professionals and citizens interested in traffic calming about roundabouts. If you live, work or play in downtown and midtown Sacramento, you’ve seen a lot of structures in the intersections which people call roundabouts, but which are not, they are traffic circles. So what is a roundabout?
A modern roundabout is a structure that allows a free flow of traffic without stop signs. Instead, they use yield signs and markings. They are most appropriately used at street intersections where both streets are fairly busy. The biggest advantage of a roundabout, for all users, is the reduction of conflict points in the intersection from thirty-two to four, as illustrated in the diagram at right!
When 3-lane streets are narrowed to 2-lane streets, street width is recovered for other uses. Traffic lanes are commonly 12 feet wide, though they can be as narrow as 9 feet and as wide as 14 feet or more. Most streets in the downtown/midtown area that I’ve recommended for narrowing are really five lanes wide, […]