Mind if I have a go futonfraggle at some kind of interpretation? (btw I love dreams). I'll just give you a sense of what these things in your dream might mean and then see what the dream's telling you overall.
Okay the car is akin to how you travel in life. If it's a crap car for instance then you're not driving yourself through life in the best possible way. And where you're seated in the car is also important. Are you driving or is someone else? If you are then you're in charge of where you're going. Its your mom in this case. A motorcycle however is a more independant, edgier means of transport. Here you're on your own and she's encouraging you to travel in your independant way, but insists on following alongside her.
Roads in dreams usually represent our own road in life, and the condition of the road can be a clue to how we're going. For myself whenever I dream of the islands and gravel unpaved roads I know I'm getting a little bit 'naive' in my thinking and not being so savvy- I kind of figured this out for me. But in general the principles are the same.
Coastline- not sure, but somewhat significant because coast implies water, and water/sea generally implies emotions. But you don't mention the ocean so perhaps you aren't in touch with them yet, or its not real clear to you. (If the sea's rough there's some emotional upheaval, if seas are calm, you're calm).
So the road's running out, and both of you can't fit. It's as if: what part of your mom that's been guiding you, or wanting to guide you, do you have to let go of now as you continue on your road in life? The fog represents lack of clarity, foggy thinking, not seeing it clearly- you can't see where you're going.
You're at some point of decision in your waking life. Do you do what you've been doing all along ie following alongside your mom's guidance, or do you reach out and go your own way? Mother's in dreams can be our own mom, but generally represent the inner maternal part of us that rescues, comforts, saves and nurtures us.
Overall it seems to represent that part of trying to get out of a comfort zone (the part of you that wants to stay/play safe is overwhelmingly represented with your twin, mother, car). You're torn between something you know is 'safe' but will topple you and lead to a 'disaster' over the cliff. Or going on into the fog not sure what's there and where the road goes. The known vs the unknown. The crunch is the road getting narrower and you have to make a decision, and its a scary one.
You'll know what this pertains to in your waking life, especially as you say, you've been getting these wierd dreams.
Got a little carried away there :-) anyhow good luck with everything and hope you get to the bottom of it!
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