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Counting cars: ideal vantage points for intersections and elevated highways
The weekend found us staying at a hotel in Makati in order to be near the recital venue for our daughter. Our room afforded a nice view of the surrounding areas (we were on the 29th floor) but the traffic engineer in me gave in to the temptation to take photos of a major intersection nearby – the Gil Puyat Avenue – Ayala Avenue intersection. These are two of the most prominent streets in the Makati CBD and strategically located at one corner is the Makati City Central Post Office and a stone’s throw away is the Makati City Central Fire Station. At another corner is the RCBC tower that hosts foreign embassies including the offices of the European Union.
Intersection of Gil Puyat Avenue (formerly Buendia Avenue) and Ayala Avenue
A view of the skyway in the distance
The view of the intersection gave some flashbacks to times when I was a student and a young researcher who had to find good vantage points for collecting traffic data particularly for intersections. Aside from the movements and the corresponding counts, the junction configuration can clearly be seen from the top and useful for developing models for analysis. There was a time when we coveted such views for traffic simulation. You can can install a camera so that you can record hours of footage to use for data extraction. The video recording also allowed one to revisit the footage in case there are questions regarding the data. The same videos can also be used for image processing for more automated, even intelligent or smart data collection using computers.
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On bike counts – Part 1
Bike counts are being conducted this June and July in many cities around the country to mainly determine the number of cyclists in various locations in the participating cities and if there was an increase in the numbers. An increase will be encouraging and should support the upgrading and expansion of the bike lanes network established during this pandemic (we are not yet in the post-Covid-19 age).
The following Images are from the Mobility Awards Facebook Page where you can find the rationale for these surveys. Vehicle or pedestrian counts are perhaps the most basic type of surveys and are conducted over certain periods of time to establish variability as well as seasonality. In the case of most if not all the counts mentioned below, surveys were and are to be conducted during the perceived peak periods for bike traffic: 6:00 to 8:00 AM and 4:00 to 6:00 PM.
Counts like these need to be evaluated or analyzed considering various contexts. While the outcomes of such counts are often presented from the point of view of advocates and there is a tendency to play with the numbers (which I will explain in more detail in succeeding posts), the bigger picture relating bike numbers to other modes of transport would be among the most important. Trip purpose is another essential factor to be considered. And there is also data on the origin-destination characteristics of trips. Historical or time series data is also important if trends are to be established.
By itself, these bicycle counts are very important data that will ultimately be useful for planning, design and construction of facilities for active transport. The lack of data on bicycles while there is a bias for motor vehicle data means we cannot see the complete picture and therefore remain car-centric when dealing with transportation issues.
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Caught (up) in traffic 