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more fragmented elevatorsystem(e.g. to rescue disabled persons and to evacuate thecritical upper half of the building faster) (secured switch for emergency access to basketlevel 2) possible acceleration and braketimes t_{i} for an emergency basketoperation :For a_{1} and a_{2} pointing in opposite directions one gets:
g * t_{1} = 4*g * t_{2} <=> g * t_{1}  4*g * t_{2} = 0 <=> g * ( t_{1}  4 * t_{2} ) = 0 <=> t_{1} = 4 * t_{2} t_{1} in equation II ) : a_{1} * (4*t_{2})^{2}  a_{2} * t_{2}^{2} = 2 * L <=> a_{1} * 16 * t_{2}^{2}  a_{2} * t_{2}^{2} = 2 * L <=> t_{2}^{2} * ( 16*a_{1}  a_{2} ) = 2 * L <=> t_{2}^{2} * ( 16*g + 4*g ) = 2 * L <=> t_{2}^{2} * 20*g = 2 * L <=> t_{2}^{2} = L / (10*g) =>
