Mainly because the country already has a wide network of double carriageways, the standards for motorways in comparison are very high.
Most sections of otoyols have 3 lanes in each direction, aside from the O-4 around Izmit, a small stretch of the O-3 between Silivri and Esenyurt, and the section of O-32 between Alaçatı and Çeşme, which only have two lanes in each direction.
Also the O-2 and the O-20 both have four lanes in each direction along the entire route.
The lanes are each 3.75 meters wide.
Most exits have a connection road, which helps avoiding wrong-way driving and illegal access to the road (bikes, tractors and horses are not allowed on otoyols).

The minimum speed is 40 km/h (25 mph) and the maximum allowed speed is 120 km/h (75 mph), although speeding is not punished under 132 km/h (82 mph).
However, on sections of the O-1 through central Istanbul the speed limit in 70 km/h (45 mph).
In most tunnels the speed limit is 90 km/h (55 mph).

Alongside otoyols, there are resting areas, which are standardized as A, B, C and D type service areas.
The D type is mainly a parking area.
The C type has a fuel station added.
The B type has a fuel station and a vehicle service station added.
The A type additionally has a motel (in urban ones, this motel is traded for a large shopping mall).

Dangerous stretches such as tunnels or bridges where there is often fog, exits, interchanges and service areas are illuminated.

Since gradients are expected to be very low and turning radii are expected to be very high, otoyols have many bridges and tunnels which makes them very expensive to construct.

Otoyol signs in Turkey are green and uses the Highway Gothic typeface.
Mainly because the country already has a wide network of double carriageways, the standards for motorways in comparison are very high. Most sections of otoyols have 3 lanes in each direction, aside from the O-4 around Izmit, a small stretch of the O-3 between Silivri and Esenyurt, and the section of O-32 between Alaçatı and Çeşme, which only have two lanes in each direction. Also the O-2 and the O-20 both have four lanes in each direction along the entire route. The lanes are each 3.75 meters wide. Most exits have a connection road, which helps avoiding wrong-way driving and illegal access to the road (bikes, tractors and horses are not allowed on otoyols).
The minimum speed is 40 km/h (25 mph) and the maximum allowed speed is 120 km/h (75 mph), although speeding is not punished under 132 km/h (82 mph). However, on sections of the O-1 through central Istanbul the speed limit in 70 km/h (45 mph). In most tunnels the speed limit is 90 km/h (55 mph).
Alongside otoyols, there are resting areas, which are standardized as A, B, C and D type service areas. The D type is mainly a parking area. The C type has a fuel station added. The B type has a fuel station and a vehicle service station added. The A type additionally has a motel (in urban ones, this motel is traded for a large shopping mall). 
Dangerous stretches such as tunnels or bridges where there is often fog, exits, interchanges and service areas are illuminated.
Since gradients are expected to be very low and turning radii are expected to be very high, otoyols have many bridges and tunnels which makes them very expensive to construct.
Otoyol signs in Turkey are green and uses the Highway Gothic typeface.
Otoyol