Do not drive through, around, or under any railroad crossing system. Once the train has passed, do not proceed until the gates are raised, signals stop flashing, bells stop ringing, and you are sure that all tracks are clear. (p.69)CONSTRUCTION AND NAINTENANCE Warning signs in construction, maintenance, or other designated work areas are diamond-shaped with black lettering on an orange or yellow background. A combination of signs, signals, lighting devices, markings, barricades, routing, and hand-signaling devices may be used around road construction, maintenance, and surveying operations and utility work. Construction and maintenance signs may mean part of a lane, an entire lane, or the whole road is blocked. These signs are also used when work is being done adjacent to the roadway, on shoulders, or in ditch areas. (p.70) Construction zones can be for a short period of time or last one or more construction seasons. Drivers are made aware of such zones by signs posted in advance. Be aware of the warning sign messages and obey them as directed. Watch and drive defensively to avoid problems. Be patient and everyone will travel through construction zones safely. Watch carefully for construction workers or moving equipment. Construction workers also have the authority to directions should be followed even if they conflict with an existing traffic control device. Khi đi qua khu vực làm việc khu vực cho phép, phải quan tâm đến các giới hạn tốc độ đăng. Đối với hầu hết xây dựng, bảo trì, hoặc các hoạt động khảo sát, giới hạn tốc độ là 45 mph, trừ khi đăng một cách khác nhau. Khu vực làm việc có thể giới hạn tốc độ lên 45 mph nơi người lao động có mặt,
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