Driving Guide

【Points to be Aware of in Winter】Road surface conditions change depending on time & place

  • Q1
    Why is attention required on expressways in winter?
    A1
    Road surface conditions change depending on time & place!

    Winter road driving conditions change due to various factors such as time and place. Make sure to pay attention in places where the expressway is especially slippery.

    Bridges and Tunnel Entrances and Exits

    Temperatures on bridges and at tunnel entrances and exits are lower than other places and slipping is dangerously easy. Slow down before you approach these places, and pay even more attention than usual when driving.

    In the Morning or at Night

    Even when the surface is just wet during the day, roads get slippery as temperatures drop at night. Be careful when driving in the morning or at night and recognize that conditions are totally different than during the day.
    Even if it was not snowing when you left, road conditions frequently change depending on the time and place. Don't be over confident when it is sunny or the temperature is not that low, pay attention to the road surface conditions.

  • Q2
    What should you be aware of?
    A2
    Understand road conditions and drive according to the situation!

    There are several types of road surface conditions on expressways in winter and the points to be aware of differ. Recognize road surface conditions correctly and try to drive according to the situation.

    Be Careful on Packed Snow or Slush

    You can drive with winter tires on "compacted snow" formed by the pressing down of new snow, but you need to pay attention, as it is more slippery than a normal road surface. On the other hand snow falling at higher temperatures forms slush, snow with lots of water. In this situation, cautious driving is required as loss of control and slipping can be caused by the snow forcing the steering to turn.

    Even if the Road Surface Looks Black you Cannot Relax!

    When snow re-freezes after melting, it forms an icy road surface that is more slippery and dangerous than fresh snow. The most important thing to recognize however is "Black Ice", which is a frozen road surface that looks black. Snow covered and ordinary icy roads appear white, but with black ice it looks like the road surface is just wet so that you do not realize that it is frozen, making it even more dangerous. Please pay close attention, even if the road surface looks black you cannot relax.

    ★ Hint from NEXCO Central Nippon!

    We are taking winter driving safety measures

    NEXCO Central Nippon is taking various measures to ensure driving safety on expressways in winter. For example, there are warning signs posted in slippery places, light-emitting snow poles that guide you when snow obstructs your view and road heating (photo) in cold regions.