Number + 辆 + Vehicle Noun
The measure word 辆 (liàng) is used specifically for counting vehicles such as cars, trucks, buses, and bicycles. Like all Chinese measure words, it must be placed between a number or demonstrative and the noun. For example, 一辆车 means 'one car.'
停车场里停着好几辆大巴车。
Tíngchē chǎng lǐ tíngzhe hǎo jǐ liàng dàbā chē.
There are several buses parked in the parking lot.
他刚买了一辆红色的自行车。
Tā gāng mǎile yí liàng hóngsè de zìxíngchē.
He just bought a red bicycle.
路上有两辆卡车挡住了去路。
Lù shàng yǒu liǎng liàng kǎchē dǎngzhùle qùlù.
Two trucks on the road are blocking the way.