Let's identify and write down the conjunctions in each of the sentences:
1.1 It is not a school's responsibility to teach driving, however schools can teach the meaning of road signs.
Conjunctions: "however"
1.2 It is not acceptable to drink and drive, nor is it acceptable to talk on a cellphone.
Conjunctions: "nor"
1.3 The road is slippery because it has been raining.
Conjunctions: "because"
1.4 Since I learnt to drive, I have been able to apply for more jobs.
Conjunctions: "Since"
1.5 Learner drivers are not allowed to drive unless there is a licensed driver with them.
Conjunctions: "unless"
Note: The "+" and "-" symbols at the beginning of the sentences seem to indicate the sentence's value in a possible scoring system. However, they don't represent conjunctions in these sentences.
I hope this helped!
~~~Harsha~~~