Caught (up) in traffic

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Daily Archives: July 4, 2016

Bicycle traffic in comparison with motorised vehicle traffic – a case in Iloilo City

I believe thatĀ there is a need to have numbers to guide planners and engineers in designing suitable bicycle facilities. It is not enough to claim there is demand since an important requirementĀ for facilities to be provided (i.e., funded and constructed) are numbers for the facilities’ justification. You don’t build mass transit systems, for example, without a valid estimate of ridership. For one, the ridership allows for the determination of revenues. Roads cannot be built without at least a number like the population of communities that will be given accessibility via that road.

Not too long ago, we were able to obtain traffic counts for the Benign S. Aquino Avenue that is also knows as the Iloilo City Diversion Road. The road includes an exclusive bikeway constructed along its airport-bound side that is supposed to benefit cyclists and encourage more people to use bicycles for commuting within the city and between the city and towns along the national highway. The following figures show the AM and PM peak hour traffic at the intersection of the diversion road and Jalandoni Street across from SM City Iloilo. Another figure shows 16-hour traffic at the same location.

Traffic Volume Count-Diversion Road-Jalandoni-PMFig. 1 – AM peak hour traffic along the Iloilo City Diversion Road including bicycle traffic along the exclusive bikeways constructed along the airport-bound side of the highway.

Traffic Volume Count-Diversion Road-Jalandoni-AMPM peak hour traffic along the Iloilo City Diversion Road including bicycle traffic along the exclusive bikeways constructed along the airport-bound side of the highway.

Traffic Volume Count-Diversion Road-Jalandoni-16H16-hour traffic along the Iloilo City Diversion Road including bicycle traffic along the exclusive bikeways constructed along the airport-bound side of the highway.

The numbers clearly show the current low volume of bicycles along the bikeways in comparison to motor vehicle traffic. Since bicycles are also presumed to carry only 1 passenger per vehicle, then the volume also translates into an even lower share in terms of mode of choice by travellers/commuters. For comparison, jeepneys will likely carry an average of 14 passengers while cars may have an occupancy of 1.5 passengers per vehicle. Perhaps a more direct comparison can be made with motorcycles, which are two-wheeled vehicles like bicycles. Only, motorcycles may typically carry 2 passengers.

I am aware that at least one NGO is employing crowd-sourcing in order to obtain bicycle traffic counts along major corridors. Neither the MMDA nor the DPWH have bicycle counts with both agencies’ traffic counts only covering motorized vehicles. Few, if any, local government units would have their own bicycle traffic counts (Perhaps Marikina has data of bicycle traffic in their city that is well known for having the country’s first and most comprehensive bikeways network?). As such, there is generally a dearth of useful data for planning bikeways. One option that advocates for the “if you build it, they will come” approach is not something that is applicable to many cases especially those that do not yet require exclusive bikeways. The folly is to allocate funding for facilities that will not be utilised by their proposed users.