The NM 502 eastbound and westbound ramps to NM 4, shown in red, are scheduled to be closed and . Courtesy image
Work on the Supplemental Environmental Project road improvements will ramp up considerably Friday, impacting the NM 4/NM 502 interchange and lane configuration of NM 502.
The safety of the workers as well as the safety of residents is of utmost importance. Law enforcement support is being sought to ensure drivers obey traffic instructions and consider the safety of the construction workers. Commuters should account for traffic delays.
Construction activities could change due to weather or other unforeseen circumstances. For now, traffic plans are as follows (shown in map as red):
• At about 6 a.m. Friday, July 20, and through Saturday, July 21, the ramp that takes eastbound drivers from Main Hill (NM 502) onto NM 4 toward White Rock will close. The ramp will reopen on Sunday.
• At about 10 a.m. on Friday, July 20, the ramp that takes westbound NM 502 drivers onto NM 4 toward White Rock will close for the day and will also be closed on Saturday, July 21. The ramp will reopen on Sunday.
Also on Friday, full reconstruction of a section of NM 502 eastbound begins resulting in closure of one of the eastbound lanes beginning at the bottom of Main Hill Road. Traffic will be diverted from about 1 p.m. to 10 p.m. Monday through Friday to accommodate peak commute times. Traffic will be rerouted as follows:
• Drivers leaving Los Alamos on Main Hill/502 will shift to one of the westbound lanes on NM 502.
• Drivers using NM 4 to leave Los Alamos/White Rock will merge onto the only open eastbound lane on NM 502.
• The NM 4 single-lane hairpin turn at the Y interchange that takes drivers north onto Main Hill/502 will close during peak traffic hours (shown in map as blue).
Workers will place orange barrels in the middle of the three westbound NM 502 lanes to divide east and westbound traffic. There will be one lane open for afternoon commuters returning to Los Alamos/White Rock and one eastbound lane for morning commuters heading east.
The successful completion of this work will ensure the safety of LANL commuters as well as the safety of local residents for many years to come. Please be patient, courteous and safe.