15. Speed limit (n): /spiːd/ /ˈlɪmɪt/ Límite de velocidad
The fastest speed allowed for vehicles in a particular area.
Example: The speed limit in this area must be respected.

16. Speed up (v): /spiːd/ /ʌp/ Acelerar
To move or happen faster.
Example: My boyfriend loves speeding up when he drives his sports car.

17. Tollbooth (n): /ˈtəʊlˌbuːθ/ Peaje
A small building where drivers pay to use a particular bridge or road.
Example: They are building another tollbooth in this highway.

18. Traffic jam (n): /ˈtræfɪk/ /dʒæm/ Atasco de tráfico
A line of vehicles waiting behind something that is blocking the road.
Example: This city has the world's longest traffic jam.