what's the different between uneven and unequal?

[Boliwar]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #89 "Verbal Learning", question 6

The police stopped the car because it had followed an ......... course down the road and asked the driver why he was going from side to side.

(a) uneven
(b) unequal
(c) unerring
(d) erratic

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #89 "Verbal Learning", answer 6

The police stopped the car because it had followed an erratic course down the road and asked the driver why he was going from side to side.

Correct answer: (d) erratic
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what's the different between uneven and unequal?

Boliwar

[Mister Micawber]

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Sometimes they are the same, but 'uneven' also means irregular.
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Native English teacher at Mister Micawber's