The appeal of bus rapid transit, or BRT, lies in a promise that sounds almost too good: roughly the cost of buses for something close to the performance of rail. Lift the buses out of congested traffic and put them in a physically segregated lane of their own. Give the stations prepaid fare gates and platforms level with the bus floor, so passengers board through several doors at once, as they would on a metro. Give the buses priority at junctions. Put these elements together and the buses run faster than ordinary street traffic and carry far more than an ordinary bus route. Curitiba, in Brazil, pioneered the approach in 1974, proving that with the right design a single road can deliver something close to the efficiency of a rail line.<\/p>\n\n\n\n
Under the right conditions BRT delivers genuinely impressive results. Bogot\u00e1\u2019s TransMilenio carries well over 1.6 million passengers a day across its network and still holds the world record for a bus system, moving more than 43,000 people per hour in a single direction at peak. Jakarta\u2019s TransJakarta has grown into the longest BRT network in the world, with daily ridership above 1.4 million. Istanbul\u2019s Metrob\u00fcs, the only intercontinental BRT line, carries close to a million a day. Guangzhou\u2019s system, opened along Zhongshan Avenue in 2010, is smaller but intense, moving some 25,000 to 28,000 passengers per hour per direction at peak and around 800,000 a day, more than any single metro line in the city, and it was the first BRT anywhere to link directly into a metro station. For a city with limited funds, fast-growing demand and a need for results within a few years rather than a decade, BRT is one of the few high-capacity options that is genuinely achievable.<\/p>\n\n\n\n
Yet even the best BRT runs into a ceiling, and the ceiling is physical. There are only three ways to add capacity: run buses more often, build more passing lanes and platforms, or use bigger vehicles. The strongest systems reach for articulated and even bi-articulated buses carrying well over 200 passengers each, squeezing out capacity without adding frequency. Every lever, though, has a limit. A bus can only be made so long before stations must grow and dwell times stretch, and beyond a certain density the lanes and stations begin to clog, buses queue at stops and bunch behind one another, and throughput falls rather than rises. The Bogot\u00e1 figures depend on very wide roads, multiple overtaking lanes and several platforms at each station, conditions most cities cannot reproduce; the textbook ceiling for BRT sits closer to 20,000 per hour per direction. Rail works the other way around. Couple several carriages into a single train and one driver moves several hundred, even more than a thousand, passengers at once. Add the full grade separation of a metro, which never competes with the street, and headways fall to around 90 seconds while capacity reaches 30,000 to 60,000 per hour per direction and beyond. This is not a gap that better management can close. It is a difference built into the two systems from the start.<\/p>\n\n\n\n
What makes it harder still is that once a BRT corridor is built, the city is locked into it. Converting a busway into segregated light rail is not impossible in principle: Ottawa rebuilt a transitway it had run for more than three decades into a light rail line, opened in 2019, the first such conversion in North America. The obstacle is rarely the load-bearing of the running surface, since a busway built to road standards can often take track directly on its existing base. What actually stalls a conversion is everything else: platforms of the wrong height and length, the wide side-platform layout of a BRT station that suits rail poorly, the need to string overhead power, tighter curve-radius requirements, and the disruption of closing a perfectly good bus service while the work is done. For the great majority of systems, never designed for conversion in the first place, this amounts to rebuilding the corridor almost from scratch. Sunk costs, existing operating contracts and political resistance pile up, and inertia drags the whole thing out, slow and expensive. Guangzhou, where ridership has slipped and some express routes have been merged or withdrawn as the metro network expands, shows just how awkward that transition can be.<\/p>\n\n\n\n
There is a further cost that bites hardest in wealthy countries. BRT capacity is built out of large numbers of buses and large numbers of drivers, and the higher the wages, the worse that arithmetic looks. Rail moves several hundred passengers behind a single driver, and a metro can move towards driverless operation and strike the cost of the driver out altogether. In high-wage economies a serious high-demand corridor almost never chooses BRT, which is why large European and North American cities grit their teeth and build rail. The natural home of BRT is where labour is relatively cheap and the city is still expanding quickly.<\/p>\n\n\n\n
In the end BRT is not a budget metro. It is a different tool, matched to a different stage of a city\u2019s growth and a different cost structure. In the right place at the right moment it can do a great deal with very little money. Put it on a corridor that should have been built for rail, in the belief that this saves money, and it usually does no more than push the real cost, along with all that inertia, into the future.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the right city BRT can move over a million riders a day, but a hard physical capacity ceiling, system lock-in and high labour costs make it a complement to rail rather than a replacement.<\/p>\n","protected":false},"author":2,"featured_media":3070,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false},"categories":[83],"tags":[1521,1520,1524,1525,1522,779,1523],"class_list":["post-3071","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infrastructure","tag-brt","tag-bus-rapid-transit","tag-light-rail","tag-metro-systems","tag-public-transport","tag-transport-policy","tag-urban-transit"],"yoast_head":"\n