Maybe a 8x32 road too. That part could be used for the road prior to the intersection. Have either a crosswalk, stop lines that you usually see at an intersection, or just nothing. That would allow room for sidewalks if the person wants a 32x32 lot nearby.
Signs? The 1x4x4 print is too large, 1x1 is too small. Maybe a 2x2x5 sign.
[Edit] Maybe have half of a road brick... and when you recolor the brick, it recolors the lines. have one brick with dashed lines and one with solid lines. That way you can make a passing and a no passing zone, or a 4-lane highway. XP