Many may not wish to strike, or cannot afford to strike, and will choose not to participate. A slowdown, however, can be nearly as effective, and can gain greater participation. Even just cutting back from 100kph to 90kph... maybe 80 kph. If some drivers slow down, it slows the whole highway down, so other truckers slow down whether they want to or not, and nobody loses their jobs. Toronto GTA has worse traffic congestion than Los Angeles. 8 million cars can't just race past all of the trucks. They can gridlock the whole highway system and just blame the traffic - but goods delivery is still slowed to a crawl. The traffic spills into the city in an attempt to go around the congestion, and soon the whole city is crawling. Back in the day the railway engineers used to do this all the time, and that is exactly why they are paid well today. In many ways, a slowdown is worse than a strike. How do you identify the strikers? You can't. Meanwhile, politicians get stuck in traffic too.