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When you have a curve in the standard R40 radius and you want to extend your layout with another track, then you can use Trixbrix R56 curves.
R56 curves are one size bigger than the standard R40.
Using this radius allows for a safe distance of 8 studs between the tracks. Layouts will look neat and properly organized.
Detailed explanation of R56 radius
The R56 is the radius measured from the center of the circle to the centerline between the rails using the LEGO® stud as the unit. LEGO® stud is 8mm. The space needed to have the full R56 circle can be calculated as follows: (56 + 4) * 2 * 8mm = 960mm = 0.96m. This measures the diameter (2 * radius) of the outer shape of the track - that's why we added 4 studs in the formula.
In general, the formula for calculating the outer diameter of the track circle is:
(R + 4) * 2 * 8mm
See also:
Curved Track R40 half
Curved Track R72