已知实数\(x_{1}\)、\(x_{2}\)、\(y_{1}\)、\(y_{2}\)满足：\(x_{1}^{2}+y_{1}^{2}=1\)，\(x_{2}^{2}+y_{2}^{2}=1\)，\(x_{1}x_{2}+y_{1}y_{2}= \dfrac {1}{2}\)，则\( \dfrac {|x_{1}+y_{1}-1|}{ \sqrt {2}}+ \dfrac {|x_{2}+y_{2}-1|}{ \sqrt {2}}\)的最大值为 ______ ．