I s Channell 19 the truckers cb channell?

Other answer:

All truckers monitor Ch.19. Ch.9 is the Emergency Channel for Help. The other channels are used for various things like company conversations with truckers nearby to avoid clogging up Ch19.
Steven S:
They are all truckers channels. 19 was made popular by a song and a movie during the CB craze of the "70s.
That depends on where you are. Generally speaking 19 runs east/west, 17 north/south at least up here in the Pacific Northwest. On 101 in Washington, 14 is the common channel.
Timbo is here:
No – it is just the popularly used one for calling out to see who is on air and then they go to a different channel for a conversation