The same scenario was used in western Oklahoma, when US 66 was initially upgraded to a four-lane highway such as from Sayre to Erick to the Texas border at Texola in 1957 and 1958 where the old paving was retained for westbound traffic and a new parallel lane built for eastbound traffic (much of this section was entirely bypassed by I-40 in 1975), and on two other sections; from Canute to Elk City in 1959 and Hydro to Weatherford in 1960, both of which were upgraded with the construction of a new westbound lane in 1966 to bring the highway up to full interstate standards and demoting the old US 66 paving to frontage road status. In the initial process of constructing I-40 across western Oklahoma, the state also included projects to upgrade the through routes in El Reno, Weatherford, Clinton, Canute, Elk City, Sayre, Erick, and Texola to four-lane highways not only to provide seamless transitions from the rural sections of I-40 from both ends of town but also to provide easy access to those cities in later years after the I-40 bypasses were completed.
the same scenario was used in western oklahoma when us 66 was initially upgraded to a four-lane highway such as from sayre to erick to the texas border at texola in 1957 and 1958 where the old paving was retained for westbound traffic and a new parallel lane built for eastbound traffic (much of this section was entirely bypassed by i-40 in 1975) and on two other sections; from canute to elk city in 1959 and hydro to weatherford in 1960 both of which were upgraded with the construction of a new westbound lane in 1966 to bring the highway up to full interstate standards and demoting the old us 66 paving to frontage road status in the initial process of constructing i-40 across western oklahoma the state also included projects to upgrade the through routes in el reno weatherford clinton canute elk city sayre erick and texola to four-lane highways not only to provide seamless transitions from the rural sections of i-40 from both ends of town but also to provide easy access to those cities in later years after the i-40 bypasses were completed