Possible Clues:

• Drivers should avoid it — and what passes through it
• Constriction of nerve on part of body
• To kiss needs courage in this traffic jam
• Delay in progress requiring courage and audacity
• Part of glass container in which jam is concentrated?
• Jam cause
• Bent locket causing constriction
• Obstruction caused when two nerves fuse
• Traffic hold-up? Courage and audacity required
• Drivers should avoid it, and what passes through it