Archive for the 'Signalization' Category

Seattle and Miami Streetcar

The Miami streetcar seems to be generating plenty of controversy. Before we convince ourselves that it’s good or bad, perhaps we need to look at another streetcar. Seattle’s streetcar, nicknamed “S.L.U.T.” for the South Lake Union Trolley, made its debut Wednesday to large crowds of riders. It also generated its share of controversy (even to the point of sabotage), so lets look at some of the issues.

The Seattle streetcar apparently does not use signal preemption. It has to stop at all traffic lights just like a bus would. This is rather ridiculous, as even Bus Rapid Transit usually calls for signals to change to give priority to the bus. An effective Miami streetcar needs to have signal preemption.

Bicyclists don’t like it and organized a protest. Seattle put the tracks on the right side of the road, precariously close to the bicyclists’ paths. Rails in the road parallel to a bicycles direction of travel are a recipe for disaster. As a bicyclist myself, I share their concerns. Streetcars like Seattle’s carry a lot more people than bicycles, and that should give them at least a slightly higher priority. At the same time, streets need to accommodate as many modes as possible–especially if we ever hope to implement a decent bike sharing program. The needs of bicyclists, pedestrians, transit, and auto all need to be considered carefully in the design of Miami’s streetcar. One alternative that has been used before is to put the rails down the middle of the street.

Seattle’s streetcar is expected to help retail business. That’s probably an accurate expectation, but we’ll have to wait and see the numbers. Most rail transit systems have increased local business, and we could probably expect the same in Miami.

There’s one unique issue that Miami will have to worry about. Every time there is a hurricane, the overhead electric lines will have to be repaired. We all know how often that happens! This makes it worthwhile to consider alternate technologies such as Innorail, which have the added benefit of removing unsightly overhead wires.

It sounds like Seattle’s streetcar was packed the first day, just new like light rail systems. Charlotte’s Lynx light rail is exceeding projections in its first weeks. Surely Miami’s streetcar would do the same.

Disco Lights

Although we don’t generally preach about the available methods to improve the flow of vehicular traffic, Larry Lebowitz from the Herald, recently dug up the truth about Miami’s hectic streetlight grid. The system is archaic to say the least, as it was considered cutting edge technology back when disco was just coming of age.

As we have come to expect with nearly every county project, the upgrading of the system is years behind schedule and millions over budget (with many consultant firms cashing in on the stupidity.) It never ceases to amaze us how such a car-based society can go so long without upgrading the timing on the streetlights.

However crucial the fix may be, we would like to clarify that there is no easy solution for the traffic in Miami. Though adjusting the timing and synchronization of the streetlights may improve the traffic flow slightly, it is not a plausible long-term solution.

The Institute of Transportation Engineers says that signal timing should be reviewed every year to maintain effectiveness and efficiency.

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