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(svn r4925) - Backport from trunk (r4911):
The AI no longer attempts to build signals under bridges.
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@ -1620,8 +1620,9 @@ clear_town_stuff:;
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/* signals too? */
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if (j&3) {
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// Can't build signals on a road.
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if (IsTileType(c, MP_STREET)) return CMD_ERROR;
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/* XXX - we need to check manually whether we can build a signal if DC_EXEC is
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not set because the rail has not actually been built */
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if (!IsTileType(c, MP_RAILWAY)) return CMD_ERROR;
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if (flag & DC_EXEC) {
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j = 4 - j;
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